Order Data

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Please note: The order page is undergoing updates and at times some links will not function properly. All updates are should be completed by this week or early next week. Thank you for your patience.

The new BIRD detector started to be used with the 23May2021 data until present.


Acquisition
Date		 Location
(Browse and Order)		 Data Products Platform
L1a L1b L2 L3-Gas L3-ET
2023-11-09 SwellenDamBox13ZA, AgulhasBox5ZA, TheewaterBox19ZA
(Preliminary)		 check mark check mark -- -- -- NASA G5
2023-11-08 FernkloofBox18ZA, SwartbergBox7ZA, TestZA
(Preliminary)		 check mark check mark -- -- -- NASA G5
2023-11-05 BergBox7ZA, KromkloofBox14ZA
(Preliminary)		 check mark check mark -- -- -- NASA G5
2023-11-01 PelettenbergBayBox10ZA, RooibergBox12ZA
(Preliminary)		 check mark check mark -- -- -- NASA G5
2023-10-31 AgulhasBox5ZA
(Preliminary)		 check mark check mark -- -- -- NASA G5
2023-10-30 TheewatersHytesCalZA, DeHoopBox6ZA, SwellandamBox13ZA
(Preliminary)		 check mark check mark -- -- -- NASA G5
2023-10-29 TheewatersBox23ZA, TableMountainBox1ZA, LangebaanBox9ZA
(Preliminary)		 check mark check mark -- -- -- NASA G5
2023-10-28 TableMountainBox1ZA, AlgalBloomZA, CederbergBox8ZA, OorlogskloofBox15ZA
(Preliminary)		 check mark check mark -- -- -- NASA G5
2023-10-26 LangebaanBox9ZA, StHelenaBayBox24ZA, GardenRouteBox11ZA
(Preliminary)		 check mark check mark -- -- -- NASA G5
2023-10-25 TheewatersHytesCalZA, TheewatersBox4ZA, RooibergBox12ZA, PlettenbergBayBox10ZA, AlgoaBayBox17ZA
(Preliminary)		 check mark check mark -- -- -- NASA G5
2023-10-20 CederbergBox8ZA
(Preliminary)		 check mark check mark -- -- -- NASA G5
2023-10-12 HarrisTX, GalvestonTX, BrazoriaTX, VermilionParLA, StTammanyParLA, JeffersonTX
(Preliminary)		 check mark check mark -- -- -- NASA G5
2023-11-15HytesTest ZA, RooibergBox12 ZA, TheewatersBox19 ZA check mark check mark check mark -- -- NASA G5
2023-11-13BenEtiveNatureRes ZA, TableMountainBox1 ZA, TankwaKarooLVISBox ZA, TheewatersBox19 ZA, Voelvleidam ZA check mark check mark check mark -- -- NASA G5
2023-11-12CapeTownAirport ZA, CederbergBox8 ZA, RiviersonderendBox16 ZA, StHelenaBayBox24 ZA, TestRun ZA, TheewatersBox19 ZA check mark check mark check mark -- -- NASA G5
2023-11-11 GoldPlate ZA check mark check mark -- -- -- NASA G5
2023-11-10BuffelsbayBox11 ZA, PettenbergBox10 ZA, RooibergBox12 ZA, TheewaterBox19 ZA check mark check mark check mark -- -- NASA G5
2023-10-22TheewatersBox3 ZA, WinelandsBox2 ZA check mark check mark check mark -- -- NASA G5
2023-07-12Stromboli IT, Vulcano IT check mark check mark check mark -- -- KBA Twin Otter
2023-07-11Parma IT, Pistoia IT, ReggioEmilia IT, Siena IT check mark check mark check mark -- -- KBA Twin Otter
2023-07-10Gironde FR, HauteGaronne FR, TarnEtGaronne FR check mark check mark check mark -- -- KBA Twin Otter
2023-07-09BouchesDuRhone FR, Herault FR, Paulilles FR check mark check mark check mark -- -- KBA Twin Otter
2023-07-08Gers FR, Gironde FR, HauteGaronne FR check mark check mark check mark -- -- KBA Twin Otter
2023-07-07Visp CH check mark check mark check mark -- -- KBA Twin Otter
2023-07-05Rosignano IT check mark check mark check mark -- -- KBA Twin Otter
2023-07-04Stromboli IT, Vulcano IT check mark check mark check mark -- -- KBA Twin Otter
2023-07-02Grosseto IT, Oristano IT, Siena IT check mark check mark check mark -- -- KBA Twin Otter
2023-06-29Grosseto IT, Pisa IT, Siena IT check mark -- check mark -- -- KBA Twin Otter
2023-06-28Rosignano IT check mark check mark check mark -- -- KBA Twin Otter
2023-06-27Grosseto IT, Siena IT check mark check mark check mark -- -- KBA Twin Otter
2023-06-26Grosseto IT, Siena IT check mark check mark check mark -- -- KBA Twin Otter
2023-06-25Grosseto IT, Siena IT check mark check mark check mark -- -- KBA Twin Otter
2023-06-22Ferrara IT, Pisa IT, Rovigo IT, Siena IT check mark check mark check mark -- -- KBA Twin Otter
2023-06-21Padua IT, Siena IT, Treviso IT, Venice IT check mark check mark check mark -- -- KBA Twin Otter
2023-06-20Ravenna IT check mark check mark check mark -- -- KBA Twin Otter
2023-06-17Siena IT, Stromboli IT, Vulcano IT check mark check mark check mark -- -- KBA Twin Otter
2023-06-16Mantua IT, Siena IT check mark check mark check mark -- -- KBA Twin Otter
2023-06-15Grosseto IT, Pisa IT, Siena IT check mark check mark check mark -- -- KBA Twin Otter
2023-06-12Siena IT, Treviso IT check mark check mark check mark -- -- KBA Twin Otter
2023-06-11Siena IT, Venice IT check mark check mark check mark -- -- KBA Twin Otter
2023-06-08Rovigo IT, Siena IT check mark check mark check mark -- -- KBA Twin Otter
2023-06-01Grosseto IT, Siena IT check mark check mark check mark -- -- KBA Twin Otter
2023-05-31Grosseto IT, Siena IT check mark check mark check mark -- -- KBA Twin Otter
2023-05-30Grosseto IT, Siena IT check mark check mark check mark -- -- KBA Twin Otter
2023-05-28Grosseto IT, Siena IT check mark check mark check mark -- -- KBA Twin Otter
2023-05-27Grosseto IT, Siena IT check mark check mark check mark -- -- KBA Twin Otter
2023-05-26Grosseto IT, Siena IT check mark check mark check mark -- -- KBA Twin Otter
2023-05-25 Perugia IT, Siena IT check mark check mark check mark check mark -- KBA Twin Otter
2023-04-27 Division2 CA check mark check mark check mark check mark -- KBA Twin Otter
2023-04-26 Division2 CA, Division5 CA check mark check mark check mark check mark -- KBA Twin Otter
2022-12-02 Brazoria TX, Crane TX, ElPaso TX, Hidalgo NM, Pima AZ, Pinal AZ, Reeves TX, Sutton TX, Upton TX check mark check mark -- -- -- NASA G5
2022-03-27 SanBernardino CA check mark check mark check mark check mark -- TOIL Twin Otter
2022-03-25 LosAngeles CA check mark check mark check mark check mark -- TOIL Twin Otter
2022-03-24 Imperial CA, SanBernardino CA check mark check mark check mark check mark -- TOIL Twin Otter
2022-03-23 PtConception CA, SantaBarbara CA, Ventura CA check mark check mark check mark check mark -- TOIL Twin Otter
2022-03-20 LosAngeles CA check mark check mark check mark check mark -- TOIL Twin Otter
2022-03-17 Mohave AZ, Yavapai AZ check mark check mark check mark check mark -- TOIL Twin Otter
2022-03-15 Garfield CO, Mesa CO check mark check mark check mark check mark -- TOIL Twin Otter
2021-08-27 Gallivare SE, Kiruna SE check mark check mark check mark check mark -- BAS Twin Otter
2021-08-26 Enontekio FI, Kiruna SE check mark check mark check mark check mark -- BAS Twin Otter
2021-08-24 Gallivare SE, Kiruna SE check mark check mark check mark check mark -- BAS Twin Otter
2021-08-23 Kiruna SE, Pajala SE check mark check mark check mark check mark -- BAS Twin Otter
2021-08-22 Enontekio FI, Kiruna SE check mark check mark check mark check mark -- BAS Twin Otter
2021-08-21 Kiruna SE check mark check mark check mark check mark -- BAS Twin Otter
2021-08-17 Kiruna SE, Muonio FI, Pajala SE check mark check mark check mark check mark -- BAS Twin Otter
2021-08-15 Arjeplog SE, Gallivare SE, Kiruna SE, Sorsele SE, Storuman SE, Stromsund SE, Vilhelmina SE check mark check mark check mark check mark -- BAS Twin Otter
2021-08-11 Herts GB, Norfolk GB, Suffolk GB check mark check mark check mark check mark -- BAS Twin Otter
2021-08-04 Herts GB, Suffolk GB check mark check mark check mark check mark -- BAS Twin Otter
2021-07-22 MiltonKeynes GB, Norfolk GB check mark check mark check mark check mark -- BAS Twin Otter
2021-07-20 Herts GB check mark check mark check mark check mark -- BAS Twin Otter
2021-07-19 Cambridgeshire GB check mark check mark check mark check mark -- BAS Twin Otter
2021-07-18 Cambridgeshire GB check mark check mark check mark check mark -- BAS Twin Otter
2021-05-26 Imperial CA check mark check mark check mark check mark -- TOIL Twin Otter
2021-05-25 LosAngeles CA check mark check mark check mark check mark -- TOIL Twin Otter
2021-05-24 LosAngeles CA, Orange CA check mark check mark check mark check mark -- TOIL Twin Otter
2021-05-23 Coconino AZ, LosAngeles CA, Mohave AZ, SanBernardino CA check mark check mark check mark check mark -- TOIL Twin Otter
2020-10-13WDTS2020SFBay CA check mark check mark check mark -- -- ER2
2019-11-24 SanJuan NM check mark check mark check mark check mark -- TOIL Twin Otter
2019-11-23Crockett TX, DeWitt TX check mark check mark check mark -- -- TOIL Twin Otter
2019-11-19 Eddy NM, Loving TX check mark check mark check mark check mark -- TOIL Twin Otter
2019-11-17 Eddy NM, Loving TX check mark check mark check mark check mark -- TOIL Twin Otter
2019-11-15 Eddy NM, Loving TX check mark check mark check mark check mark -- TOIL Twin Otter
2019-11-14 Eddy NM, Loving TX check mark check mark check mark check mark -- TOIL Twin Otter
2019-11-13 Ector TX, Ward TX check mark check mark check mark check mark -- TOIL Twin Otter
2019-09-12Imperial CA, Riverside CA, SanBernardino CA check mark check mark check mark -- -- ER2
2019-06-30 Cambridgeshire GB check mark check mark check mark check mark -- BAS Twin Otter
2019-06-29 Cambridgeshire GB, MiltonKeynes GB check mark check mark check mark check mark -- BAS Twin Otter
2019-06-28 Berkshire GB, Cambridgeshire GB, Oxon GB check mark check mark check mark check mark -- BAS Twin Otter
2019-06-25Siena IT check mark -- check mark -- -- BAS Twin Otter
2019-06-24 Grosseto IT, Siena IT check mark check mark check mark check mark -- BAS Twin Otter
2019-06-23 Grosseto IT, Siena IT check mark check mark check mark check mark -- BAS Twin Otter
2019-06-20 Grosseto IT, Siena IT check mark check mark check mark check mark -- BAS Twin Otter
2019-06-19 Grosseto IT check mark check mark check mark check mark -- BAS Twin Otter
2019-06-18 Grosseto IT, Pisa IT check mark check mark check mark check mark -- BAS Twin Otter
2019-06-17 Grosseto IT check mark check mark check mark check mark -- BAS Twin Otter
2019-05-02 Esmeralda NV, Placer CA check mark check mark check mark check mark -- None
2019-05-01 Emery UT, Placer CA, Yolo CA check mark check mark check mark check mark -- TOIL Twin Otter
2019-04-30 Mesa CO check mark check mark check mark check mark -- TOIL Twin Otter
2018-09-18MegaboxLine47 CA, MegaboxLine48 CA, MegaboxLine50 CA, MegaboxLine52 CA check mark check mark check mark -- -- ER2
2018-09-17MegaboxLine49 CA, MegaboxLine51 CA check mark check mark check mark -- -- ER2
2018-09-13Douglas NV, Kern CA, Monterey CA, Nye NV, Sonoma CA, Yuba CA check mark check mark check mark -- -- ER2
2018-09-04MegaboxLine02 CA, MegaboxLine04 CA, MegaboxLine06 CA check mark check mark check mark -- -- ER2
2018-08-31MegaboxLine08 CA, MegaboxLine09 CA, MegaboxLine10 CA, MegaboxLine11 CA check mark check mark check mark -- -- ER2
2018-08-28MegaboxLine41 CA, MegaboxLine42 CA, MegaboxLine43 CA, MegaboxLine44 CA, MegaboxLine45 CA, MegaboxLine46 CA check mark check mark check mark -- -- ER2
2018-08-16Alameda CA, ContraCosta CA, Sacramento CA, SanFrancisco CA, Solano CA check mark check mark check mark -- -- ER2
2018-08-09Colusa CA, Lake CA, Mariposa CA, Tuolumne CA check mark check mark check mark -- -- ER2
2018-06-12MegaboxLine12 CA, MegaboxLine13 CA, MegaboxLine14 CA, MegaboxLine15 CA, MegaboxLine16 CA, MegaboxLine23 CA check mark check mark check mark -- -- ER2
2018-06-08MegaboxLine25 CA, MegaboxLine27 CA, MegaboxLine29 CA, MegaboxLine31 CA, MegaboxLine33 CA, MegaboxLine34 CA check mark check mark check mark -- -- ER2
2018-06-04MegaboxLine35 CA, MegaboxLine36 CA, MegaboxLine37 CA, MegaboxLine38 CA, MegaboxLine39 CA, MegaboxLine40 CA check mark check mark check mark -- -- ER2
2018-06-01MegaboxLine17 CA, MegaboxLine18 CA, MegaboxLine19 CA, MegaboxLine20 CA, MegaboxLine21 CA, MegaboxLine22 CA check mark check mark check mark -- -- ER2
2018-05-29MegaboxLine24 CA, MegaboxLine26 CA, MegaboxLine28 CA, MegaboxLine30 CA, MegaboxLine32 CA check mark check mark check mark -- -- ER2
2018-05-22 MegaboxLine01 CA, MegaboxLine03 CA, MegaboxLine05 CA, MegaboxLine07 CA check mark -- -- -- -- ER2
2018-02-20Hawaii HI check mark check mark check mark -- -- ER2
2018-02-12Lanai HI, Maui HI check mark check mark check mark -- -- ER2
2018-02-10Hawaii HI check mark check mark check mark -- -- ER2
2018-02-09Hawaii HI check mark check mark check mark -- -- ER2
2018-02-08Hawaii HI check mark check mark check mark -- -- ER2
2018-02-06Hawaii HI check mark check mark check mark -- -- ER2
2018-02-03Hawaii HI check mark check mark check mark -- -- ER2
2018-02-01Hawaii HI check mark check mark check mark -- -- ER2
2018-01-30Hawaii HI check mark check mark check mark -- -- ER2
2018-01-26Kauai HI, Lanai HI, Maui HI, Molokai HI, Oahu HI check mark check mark check mark -- -- ER2
2018-01-18Hawaii HI, Honolulu HI check mark check mark check mark -- -- ER2
2018-01-11Diablo Canyon Coast CA, Santa Barbara CA, Ventura CA check mark check mark check mark -- -- ER2
2017-06-12 Kern River Oil CA check mark check mark check mark check mark -- TOIL Twin Otter
2017-06-09 Navajo Generating Station AZ check mark check mark check mark check mark -- TOIL Twin Otter
2017-06-08 Garfield CO check mark check mark check mark check mark -- TOIL Twin Otter
2016-01-26 Aliso Canyon Northeast to Southwest Low CA, Honor Rancho CA check mark check mark check mark check mark -- TOIL Twin Otter
2016-01-25 Aliso Canyon North to South Low CA, Huntington Gardens near Pasadena CA, Hyperion Coast - Marina Del Rey, El Segundo, & Manhattan Beach CA, Jet Propulsion Laboratory CA, Playa in Marina Del Rey CA check mark check mark check mark check mark -- TOIL Twin Otter
2016-01-21 Honor Rancho CA check mark check mark check mark check mark -- TOIL Twin Otter
2016-01-17 Aliso Canyon North to South Low CA check mark check mark check mark check mark -- TOIL Twin Otter
2016-01-14 Aliso Canyon Northeast to Southwest High CA, Aliso Canyon North to South High CA check mark check mark check mark check mark -- TOIL Twin Otter
2016-01-12 Aliso Canyon North to South High CA check mark check mark check mark check mark -- TOIL Twin Otter
2015-05-03Cuprite Hills in Esmeralda County NV check mark check mark check mark -- -- TOIL Twin Otter
2015-05-02 Edenvale Dairy CA, Schilling CA, Tipton CA, Vintage Dairy CA check mark check mark check mark check mark -- TOIL Twin Otter
2015-05-01 Hilarides Dairy CA, Royal Farm CA, Tipton CA check mark check mark check mark check mark -- TOIL Twin Otter
2015-04-29 Belridge CA, Feedlots South Bakersfield CA, Lost Hills CA, Midway Sunset CA check mark check mark check mark check mark -- TOIL Twin Otter
2015-04-28 Controlled Release CA, Source 27 CA check mark check mark check mark check mark -- TOIL Twin Otter
2015-04-27Meteor Crater AZ, Tipton CA check mark -- check mark -- -- TOIL Twin Otter
2015-04-23 Durango Walmart CO, Target Area 3 CO check mark check mark check mark check mark -- TOIL Twin Otter
2015-04-22 Target Area 2 NM, Target Area 3 CO, Target Area 4 NM check mark check mark check mark check mark -- TOIL Twin Otter
2015-04-21 Grand Blanco NM check mark check mark check mark check mark -- TOIL Twin Otter
2015-04-20 Grand Junction Transit CO, La Plata NM check mark check mark check mark check mark -- TOIL Twin Otter
2015-04-19 Bloomfield NM, La Plata NM, Target Area 4 NM check mark check mark check mark check mark -- TOIL Twin Otter
2015-02-15Algodones dunes CA, Hiller Mountains NV, Salton Sea CA, UCI Gas Lines CA check mark check mark check mark -- -- TOIL Twin Otter
2015-02-13 Cuprite Hills in Esmeralda County NV, Glenarm Power Plant CA, Jet Propulsion Laboratory CA check mark check mark check mark check mark -- TOIL Twin Otter
2015-02-12 Feedlots South Bakersfield CA, West Pipeline CA check mark check mark check mark check mark -- TOIL Twin Otter
2015-02-11 Methane Controlled Release Site CA check mark check mark check mark check mark -- TOIL Twin Otter
2015-02-09 AVNG Sources 2 and 3 CA, Kern River Oil Field CA check mark check mark check mark check mark -- TOIL Twin Otter
2015-02-08 AVNG Sources 2 and 3 CA, Feedlots South Bakersfield CA, Kern River Oil Field CA check mark check mark check mark check mark -- TOIL Twin Otter
2015-02-05 Kern River Oil Field CA check mark check mark check mark check mark -- TOIL Twin Otter
2015-02-04 Feedlots South Bakersfield CA, Methane Controlled Release Site CA check mark check mark check mark check mark -- TOIL Twin Otter
2015-02-01 Cuprite Hills in Esmeralda County NV, Glenarm Power Plant CA, Jet Propulsion Laboratory CA check mark check mark check mark check mark -- TOIL Twin Otter
2014-07-12Cuprite Hills in Esmeralda County NV, Death Valley CA, Lake Tahoe CA/NV, San Joaquin (SJER) CA, Soaproot Saddle near Fresno CA, Teakettle near Fresno CA, Yerington NV check mark check mark check mark -- -- TOIL Twin Otter
2014-07-09AAO Lost Hills CA, Citrus Maricopa CA, Gallo Colony Vineyard CA, Gallo Mature Vineyard CA, Gallo Young Vineyard CA, Harris Ranch Lot CA, Kettleman Hills CA, Russel Ranch CA, Tonzi Ranch CA check mark check mark check mark -- -- TOIL Twin Otter
2014-07-08 AAO Paramount CA, Almond Delano CA, Almond Poterville CA, Bakerfield pipeline N CA, Citrus Bakersfield CA, Death Valley CA, Kern River oil field CA, Puente Hills landfill HR CA, Trona in Inyo County CA check mark check mark check mark check mark -- TOIL Twin Otter
2014-07-07 Bakerfield pipeline N CA, Bakerfield pipeline S CA, Belridge CA, Elk Hills CA, Granada Hills CA check mark check mark check mark check mark -- TOIL Twin Otter
2014-07-06Alford Mountain CA, Algodones dunes CA, Cima CA, Jet Propulsion Laboratory CA, Kelso Dunes in Mojave National Preserve CA, Mountain Pass CA, N San Jacinto CA, Palmspring CA, Riverside CA, Salton Sea CA, West Salton Sea CA check mark check mark check mark -- -- TOIL Twin Otter
2014-07-05 El Segundo CA, Huntington Beach CA, Huntington Gardens near Pasadena CA, Jet Propulsion Laboratory CA, La Brea Tar Pits CA, Long Beach NG CA, Long Beach refinery CA, Los Angeles CA, Paramount Refinery CA, Santa Barbara CA, Whittier CA check mark check mark check mark check mark -- TOIL Twin Otter
2014-07-03 Canyonlands National Park UT, Cuprite Hills in Esmeralda County NV, Desert Rock NV, Fire Target of Opportunity UT, Jet Propulsion Laboratory CA, Navajo Generating Station AZ, North Death Valley NV, Trona in Inyo County CA check mark check mark check mark check mark -- TOIL Twin Otter
2014-07-02 Mesa and Garfield CO check mark check mark check mark check mark -- TOIL Twin Otter
2013-06-26 HP1_HP2 WY, HP1_RP_HP2 WY, HP2_HP1 WY, HP2_RP_HP1 WY check mark check mark -- -- -- TOIL Twin Otter
2013-06-25 HP1_HP2 WY, HP2_HP1 WY, LP1_LP2 WY, LP3_LP4 WY, MP1_MP2 WY, MP2_MP1 WY check mark check mark -- -- -- TOIL Twin Otter
2013-06-24 HP1_HP2 WY, HP2_HP1 WY, LP1_LP2 WY, LP2_LP1 WY, LP3_LP4 WY, LP4_LP3 WY, RPN_RPS WY, RPS_RPN WY check mark check mark -- -- -- TOIL Twin Otter
2013-06-23 HP1_HP2 WY, HP2_HP1 WY check mark -- -- -- -- TOIL Twin Otter
2013-04-30 Navajo Generating Station AZ check mark -- -- -- -- TOIL Twin Otter
2013-04-29 Algodones Dunes near Yuma CA, Cuprite Hills in Esmeralda County NV, Death Valley CA, Salton Sea CA check mark -- -- -- -- TOIL Twin Otter
2013-04-27 Baldwin & Seal Beach CA, Jet Propulsion Laboratory CA, La Brea Tar Pits CA, Landfill near Wittier CA, Long Beach Refinery CA, Oil Platform off the coast of Huntington Beach CA, Oil Refineries in Carson CA, Oil Refineries in El Segundo CA, Oil Refineries in Long Beach CA, Oil Refineries in Torrance CA, Oil Wells near Culver City CA, Paramount Refinery CA, Playa in Marina Del Rey CA check mark -- -- -- -- TOIL Twin Otter
2013-04-26 Dairies near Ontario CA, Huntington Gardens near Pasadena CA, Jet Propulsion Laboratory CA, Refueling near San Bernardino CA, Santa Barbara CA check mark -- -- -- -- TOIL Twin Otter
2013-04-25 Cogeneration Plants near Bakersfield CA, Harris Ranch Lot CA, Kettleman Hills CA, Lake Tahoe CA/NV, Oil Refinery near Bakersfield CA, Russel Ranch CA, Sutter Buttes near Sacramento CA, Yerington NV check mark -- -- -- -- TOIL Twin Otter
2013-04-24 Birch Creek near Bishop CA, Cuprite Hills in Esmeralda County NV, Death Valley NV, Fire near Pine Flat Lake CA, Hot Creek near Mammorth Lakes CA, Mammoth Pacific Geothermal Plant CA, Soaproot Saddle near Fresno CA, Teakettle near Fresno CA, Trona in Inyo County CA check mark -- -- -- -- TOIL Twin Otter
2013-04-23 Coral Pink UT, Kelso Dunes in Mojave National Preserve CA, Navajo Generating Station AZ check mark -- -- -- -- TOIL Twin Otter