Frq

Comprehensive frequency data for FAA facilities including towers, ARTCC, FSS, NAVAID, ASOS/AWOS, and other communication outlets

Source: NASRTable: FRQVersion: e25086c3e952 (effective 2026-04-16)

Alternative view of frequency, use, and airport servicing data from TWR.txt, AFF.txt, COM.txt, APT.txt, AWOS.txt, and FSS.txt subscriber files. Unique record key is FACILITY+SERVICED_FACILITY+SERVICED_SITE_TYPE_CODE+SERVICED_STATE+FREQ+FREQ_USE+SECTORIZATION.

Example query

# Introspect the Frq type in GraphiQL at https://api.nav.sortie.co/graphql
# Example shape (pair with a compatible root query field):
{
  # ...rootQuery... {
    effDate
    facility
    facName
    facilityType
  # }
}

Run at https://api.nav.sortie.co/graphql — GraphiQL is available in-browser.

Fields (21)

Field	Type	Description	Units	Enum
effDate ← EFF_DATE	String	The 28 Day NASR Subscription Effective Date in format YYYY/MM/DD
facility ← FACILITY	String	Facility ID, or Facility Name for RCAG sites. NULL for AFIS, CTAF, GCO, and UNICOM facility types which have no Facility ID or Facility Name in NASR
facName ← FAC_NAME	String	Official Facility Name. NULL for AFIS, CTAF, GCO, UNICOM, and ASOS/AWOS facility types which have no Facility Name in NASR
facilityType ← FACILITY_TYPE	FrqFacilityType	Type of facility associated with the frequency record. RCO and RCO1 serve the same function as a remote communication outlet; RCO1 may exist when two separate sites share the same identifier		15 values ARTCC — Air Route Traffic Control Center ASOS_AWOS — Automated Surface/Weather Observation System ATCT — Airport Traffic Control Tower ATCT-A/C — Airport Traffic Control Tower with Approach Control ATCT-RAPCON — Airport Traffic Control Tower with Radar Approach Control ATCT-RATCF — Airport Traffic Control Tower with Radar Air Traffic Control Facility ATCT-TRACON — Airport Traffic Control Tower with Terminal Radar Approach Control CERAP — Combined Center Radar Approach Control FSS — Flight Service Station NAVAID — Navigational Aid NON-ATCT — Non-Airport Traffic Control Tower communication facility RCAG — Remote Communication Air/Ground facility RCO — Remote Communication Outlet RCO1 — Remote Communication Outlet (alternate identifier, collocated or on-airport variant) TRACON — Terminal Radar Approach Control
artccOrFssId ← ARTCC_OR_FSS_ID	ArtccOrFssId	For RCAG facility types, contains the associated ARTCC ID. For RCO/RCO1 facility types, contains the associated FSS ID. Provided as a convenience reference to the source resource in NASR		96 values ABQ — Albuquerque ANB — Anniston AND — Anderson AOO — Altoona BDR — Bridgeport BGR — Bangor BNA — Nashville BOI — Boise BRW — Barrow BTV — Burlington BUF — Buffalo CDB — Cold Bay CDC — Cedar City CLE — Cleveland COU — Columbia CPR — Casper CXO — Conroe DAY — Dayton DCA — Washington Reagan DEN — Denver DLG — Dillingham DRI — De Ridder EKN — Elkins ENA — Kenai FAI — Fairbanks FOD — Fort Dodge FTW — Fort Worth GFK — Grand Forks GNV — Gainesville GRB — Green Bay GTF — Great Falls GWO — Greenwood HHR — Hawthorne HNL — Honolulu HON — Huron HUF — Terre Haute ICT — Wichita IKK — Kankakee IPT — Williamsport ISP — Islip JBR — Jonesboro JNU — Juneau KTN — Ketchikan LAN — Lansing LOU — Louisville MCN — Macon MIA — Miami MIV — Millville MKL — Jackson MLC — McAlester MMV — McMinnville OAK — Oakland OLU — Columbus OME — Nome ORT — Northway OTZ — Kotzebue PAQ — Palmer PIE — St. Petersburg PNM — Princeton PRC — Prescott RAL — Riverside RDU — Raleigh-Durham RIU — Riverside RNO — Reno SAN — San Diego SCC — Deadhorse SEA — Seattle SIT — Sitka SJT — San Angelo SJU — San Juan STL — St. Louis ZAB — Albuquerque ARTCC ZAN — Anchorage ARTCC ZAU — Chicago ARTCC ZBW — Boston ARTCC ZDC — Washington ARTCC ZDV — Denver ARTCC ZFW — Fort Worth ARTCC ZHN — Hana ARTCC ZHU — Houston ARTCC ZID — Indianapolis ARTCC ZJX — Jacksonville ARTCC ZKC — Kansas City ARTCC ZLA — Los Angeles ARTCC ZLC — Salt Lake City ARTCC ZMA — Miami ARTCC ZME — Memphis ARTCC ZMP — Minneapolis ARTCC ZNY — New York ARTCC ZOA — Oakland ARTCC ZOB — Cleveland ARTCC ZSE — Seattle ARTCC ZSU — San Juan ARTCC ZTL — Atlanta ARTCC ZUA — Guam ARTCC ZYL — Baton Rouge
cpdlc ← CPDLC	Cpdlc	Controller Pilot Data Link Communications (CPDLC) remark associated with the facility		CPDLC (LOGON KUSA) — Controller Pilot Data Link Communications with logon KUSA CPDLC DCL (LOGON KUSA) — Controller Pilot Data Link Communications with Digital Clearance Delivery and logon KUSA
towerHrs ← TOWER_HRS	String	Operating hours of the tower. Only populated for ATCT facility types where the FACILITY equals the SERVICED_FACILITY
servicedFacility ← SERVICED_FACILITY	String	The Facility ID (or Facility Name if Facility Type is RCAG) that is serviced by the frequencies listed. Non-null field. Part of the unique record key
servicedFacName ← SERVICED_FAC_NAME	String	The official Facility Name of the serviced facility
servicedSiteType ← SERVICED_SITE_TYPE	ServicedSiteType	Facility type of the serviced facility. Part of the unique record key (as SERVICED_SITE_TYPE_CODE)		33 values AIRPORT — Airport ARTCC — Air Route Traffic Control Center ASOS — Automated Surface Observing System AWOS-1 — Automated Weather Observing System type 1 AWOS-2 — Automated Weather Observing System type 2 AWOS-3 — Automated Weather Observing System type 3 AWOS-3P — Automated Weather Observing System type 3 with precipitation AWOS-3PT — Automated Weather Observing System type 3 with precipitation and thunderstorm AWOS-3T — Automated Weather Observing System type 3 with thunderstorm AWOS-4 — Automated Weather Observing System type 4 AWOS-A — Automated Weather Observing System type A AWOS-AV — Automated Weather Observing System type AV BALLOONPORT — Balloonport CERAP — Combined Center Radar Approach Control DME — Distance Measuring Equipment FSS — Flight Service Station GLIDERPORT — Gliderport HELIPORT — Heliport MARINE NDB — Marine Non-Directional Beacon NDB — Non-Directional Beacon NDB/DME — Non-Directional Beacon with Distance Measuring Equipment RADIO — Radio facility RCAG — Remote Communication Air/Ground facility RCO — Remote Communication Outlet RCO1 — Remote Communication Outlet (alternate identifier) SEAPLANE BASE — Seaplane Base TACAN — Tactical Air Navigation TRACON — Terminal Radar Approach Control ULTRALIGHT — Ultralight flight park VOR — VHF Omnidirectional Range VOR/DME — VHF Omnidirectional Range with Distance Measuring Equipment VORTAC — VOR and TACAN collocated VOT — VOR Test Signal facility
latDecimal ← LAT_DECIMAL	Float	Facility Reference Point Latitude in decimal degrees format	degrees
longDecimal ← LONG_DECIMAL	Float	Facility Reference Point Longitude in decimal degrees format	degrees
servicedCity ← SERVICED_CITY	String	Associated city name of the serviced facility
servicedState ← SERVICED_STATE	ServicedState	Two-letter state or territory postal code of the serviced facility. Part of the unique record key		62 values AK — Alaska AL — Alabama AR — Arkansas AS — American Samoa AZ — Arizona BS — Bahamas CA — California CO — Colorado CT — Connecticut DC — District of Columbia DE — Delaware FL — Florida GA — Georgia GU — Guam HI — Hawaii IA — Iowa IB — International/Unknown ID — Idaho IL — Illinois IN — Indiana KS — Kansas KY — Kentucky LA — Louisiana MA — Massachusetts MD — Maryland ME — Maine MI — Michigan MN — Minnesota MO — Missouri MP — Northern Mariana Islands MS — Mississippi MT — Montana NC — North Carolina ND — North Dakota NE — Nebraska NH — New Hampshire NJ — New Jersey NM — New Mexico NV — Nevada NY — New York OA — Pacific Ocean Area OG — Other Geography OH — Ohio OK — Oklahoma OR — Oregon PA — Pennsylvania PR — Puerto Rico QM — International waters/airspace QW — International waters/airspace (alternate) RI — Rhode Island SC — South Carolina SD — South Dakota TN — Tennessee TX — Texas UT — Utah VA — Virginia VI — Virgin Islands VT — Vermont WA — Washington WI — Wisconsin WV — West Virginia WY — Wyoming
servicedCountry ← SERVICED_COUNTRY	ServicedCountry	Country postal code for the country in which the serviced facility is located		22 values AG — Antigua and Barbuda AI — Anguilla AN — Netherlands Antilles BB — Barbados BM — Bermuda BS — Bahamas CA — Canada DO — Dominican Republic FM — Federated States of Micronesia GP — Guadeloupe HT — Haiti KN — Saint Kitts and Nevis MF — Saint Martin MH — Marshall Islands MQ — Martinique MX — Mexico PR — Puerto Rico PW — Palau TC — Turks and Caicos Islands TT — Trinidad and Tobago US — United States VG — British Virgin Islands
towerOrCommCall ← TOWER_OR_COMM_CALL	String	Radio call sign used by a pilot to contact the ATC or FSS facility
primaryApproachRadioCall ← PRIMARY_APPROACH_RADIO_CALL	String	Radio call sign of the facility that furnishes primary approach control
freq ← FREQ	String	Frequency for serviced facility use. For NAVAIDs with DME/TACAN Channel, displayed as FREQ/CHAN. Part of the unique record key	MHz
sectorization ← SECTORIZATION	String	Sectorization based on serviced facility or airway boundaries, or limitations based on runway usage. For ARTCC and RCAG, identifies the frequency altitude as Low, High, Low/High, or Ultra-High. Part of the unique record key
freqUse ← FREQ_USE	String	Description of the frequency use for the serviced facility. Part of the unique record key
remark ← REMARK	String	Free-form remark text that further describes a specific information item associated with the frequency record