# Frq

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

**Source:** NASR table `FRQ` · version `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

```graphql
# 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 available in-browser).

## Fields

| Field | Type | Description | Units | Enum |
|---|---|---|---|---|
| `effDate` | `String` | The 28 Day NASR Subscription Effective Date in format YYYY/MM/DD |  |  |
| `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` | `String` | Official Facility Name. NULL for AFIS, CTAF, GCO, UNICOM, and ASOS/AWOS facility types which have no Facility Name in NASR |  |  |
| `facilityType` | `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 |  | `ARTCC`, `ASOS_AWOS`, `ATCT`, … (15 values) |
| `artccOrFssId` | `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 |  | `ABQ`, `ANB`, `AND`, … (96 values) |
| `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` | `String` | Operating hours of the tower. Only populated for ATCT facility types where the FACILITY equals the SERVICED_FACILITY |  |  |
| `servicedFacility` | `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` | `String` | The official Facility Name of the serviced facility |  |  |
| `servicedSiteType` | `ServicedSiteType` | Facility type of the serviced facility. Part of the unique record key (as SERVICED_SITE_TYPE_CODE) |  | `AIRPORT`, `ARTCC`, `ASOS`, … (33 values) |
| `latDecimal` | `Float` | Facility Reference Point Latitude in decimal degrees format | degrees |  |
| `longDecimal` | `Float` | Facility Reference Point Longitude in decimal degrees format | degrees |  |
| `servicedCity` | `String` | Associated city name of the serviced facility |  |  |
| `servicedState` | `ServicedState` | Two-letter state or territory postal code of the serviced facility. Part of the unique record key |  | `AK`, `AL`, `AR`, … (62 values) |
| `servicedCountry` | `ServicedCountry` | Country postal code for the country in which the serviced facility is located |  | `AG`, `AI`, `AN`, … (22 values) |
| `towerOrCommCall` | `String` | Radio call sign used by a pilot to contact the ATC or FSS facility |  |  |
| `primaryApproachRadioCall` | `String` | Radio call sign of the facility that furnishes primary approach control |  |  |
| `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` | `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` | `String` | Description of the frequency use for the serviced facility. Part of the unique record key |  |  |
| `remark` | `String` | Free-form remark text that further describes a specific information item associated with the frequency record |  |  |

## Enum values

### `facilityType` (`FrqFacilityType`)

| Code | Description |
|---|---|
| `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` (`ArtccOrFssId`)

| Code | Description |
|---|---|
| `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 |

### `servicedSiteType` (`ServicedSiteType`)

| Code | Description |
|---|---|
| `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 |

### `servicedState` (`ServicedState`)

| Code | Description |
|---|---|
| `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` (`ServicedCountry`)

| Code | Description |
|---|---|
| `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 |

## Column provenance

Every field maps 1:1 to a column in the `FRQ` table of `nasr.db`. Original FAA column names:

| GraphQL field | SQLite column |
|---|---|
| `effDate` | `EFF_DATE` |
| `facility` | `FACILITY` |
| `facName` | `FAC_NAME` |
| `facilityType` | `FACILITY_TYPE` |
| `artccOrFssId` | `ARTCC_OR_FSS_ID` |
| `cpdlc` | `CPDLC` |
| `towerHrs` | `TOWER_HRS` |
| `servicedFacility` | `SERVICED_FACILITY` |
| `servicedFacName` | `SERVICED_FAC_NAME` |
| `servicedSiteType` | `SERVICED_SITE_TYPE` |
| `latDecimal` | `LAT_DECIMAL` |
| `longDecimal` | `LONG_DECIMAL` |
| `servicedCity` | `SERVICED_CITY` |
| `servicedState` | `SERVICED_STATE` |
| `servicedCountry` | `SERVICED_COUNTRY` |
| `towerOrCommCall` | `TOWER_OR_COMM_CALL` |
| `primaryApproachRadioCall` | `PRIMARY_APPROACH_RADIO_CALL` |
| `freq` | `FREQ` |
| `sectorization` | `SECTORIZATION` |
| `freqUse` | `FREQ_USE` |
| `remark` | `REMARK` |