Flight Service Station Uhf Frequency Assignments

For filing and opening VFR flight plans, pushing back your ETA because of a delay, and a few more obscure things which you can find in section 4-1-21 of the AIM you would contact Flight Service (addressed as "region Radio" - e.g. "New York Radio" or "Bridgeport Radio")

The universal flight service frequency is 122.2, and above 5000 feet you should be able to get someone on that frequency, but it's not guaranteed.

If yo can't raise someone on 122.2, or you're below 5000 feet, there are local Flight Service frequencies are listed on VORs as shown below. As a general rule if you can receive the VOR you can talk to Flight Service with the frequencies listed, and using these local frequencies helps avoid congestion on the universal frequency.


Initial calls to Flight Service should take the form:

(as above for Flight Watch, Who you're talking to ("New York Radio" in the example above), Who you are, and Where you are.)

There's a little catch with Flight Service frequencies: If there is an after the frequency (as shown for 122.1 here) it is a receive-only frequency. You will talk to flight service on that frequency, but you will listen to the VOR's audio channel to hear Flight Service's responses.
When you call Flight Service using one of these frequencies make sure your nav radio is tuned to the VOR and the voice channel volume is up, and let them know which VOR you're listening to as opposed to your location.
In this example if you were contacting Flight Service on 1221 the call would be .

For weather (giving PIREPs or asking for a weather report) you will also talk to Flight Service: There used to be a separate service (Flight Watch) and frequency for this, but weather-related tasks were consolidated into the general Flight Service frequency in late 2015.

Radio coverage and contact procedures are identical to what was mentioned above for dealing with flight plan stuff, but you should make it clear you're looking for weather updates (add "requesting enroute weather") or that you want to give a PIREP (add "With a pilot report") so the Flight Service Specialist on the other end of the radio knows what you're looking for.

As weather is generally a localized phenomenon (and weather updates or PIREPs can take some time to relay) it is probably be a good idea to use the local flight service frequencies for weather-relatedrather than the universal 122.2 frequency to avoid congestion there, though I don't believe the FAA or Flight Service has issued any official guidance on this since Flight Watch was consolidated with the rest of Flight Service.


Common VHF Frequencies

In the US the civil aircraft communications band (118-137 MHz) generally uses 25 kHz spaced channels.

As of 2010 aeronautical enroute and flight test stations may use 8.33 kHz spaced channels in the 121.4-123.6, 128.825-132.0 and 136.5-136.875 MHz ranges.

Frequency  Type  Tone  Alpha Tag  Description  Mode  Tag 
121.50000  VHF Guard Aircraft Emergency and Distress (VHF Guard) AM Aircraft 
121.95000  AvSup 121.95 Aviation Support AM Business 
122.75000  Fixed Air-Air Fixed wing aircraft air-to-air AM Aircraft 
122.77500  AvSup 122.775 Aviation Support AM Business 
122.85000  Multi 122.85 Multicom, Aviation Support AM Aircraft 
122.90000  Multi 122.9 Multicom, Search and Rescue Training AM Aircraft 
122.92500  Multi 122.925 Multicom - Special Use, Natural resource management AM Aircraft 
123.02500  Heli Air-Air Helicopter Air-to-Air AM Aircraft 
123.10000  SAR Primary Search and Rescue primary, ATC for special events secondary AM Aircraft 
123.12500  FlightTest123.12 Flight Test itinerant AM Business 
123.15000  FlightTest123.15 Flight Test itinerant AM Business 
123.17500  FlightTest123.17 Flight Test itinerant AM Business 
123.20000  FlightTest123.2 Flight Test AM Business 
123.22500  FlightTest123.22 Flight Test AM Business 
123.25000  FlightTest123.25 Flight Test AM Business 
123.27500  FlightTest123.27 Flight Test AM Business 
123.30000  AvSup 123.3 Aviation Support AM Business 
123.32500  FlightTest123.32 Flight Test AM Business 
123.35000  FlightTest123.35 Flight Test AM Business 
123.37500  FlightTest123.37 Flight Test AM Business 
123.40000  FlightTest123.4 Flight Test itinerant AM Business 
123.42500  FlightTest123.42 Flight Test itinerant AM Business 
123.45000  FlightTest123.45 Flight Test/Unofficial Air-to-Air AM Business 
123.47500  FlightTest123.47 Flight Test AM Business 
123.50000  AvSup 123.5 Aviation Support AM Business 
123.52500  FlightTest123.52 Flight Test AM Business 
123.55000  FlightTest123.55 Flight Test AM Business 
123.57500  FlightTest123.57 Flight Test AM Business 
126.20000  MilCom 126.2 Military Common (advisory) AM Aircraft 
134.10000  MilCom 134.1 Military Common (advisory) AM Aircraft 
135.85000  FltIns135.85 FAA Flight Inspection AM Federal 
135.95000  FltIns135.95 FAA Flight Inspection AM Federal 
122.00000  Flt Watch Wx Flight Watch Weather AM Aircraft 
129.52500  Deicing Comm Deicing Common AM Business 
121.77500  ELT Training Emergency Locator Transmitter (ELT) Training Beacons AM Aircraft 
122.70000  FAA 122.700 Unicom AM Aircraft 
122.72500  FAA 122.725 Unicom AM Aircraft 
122.80000  FAA 122.8 Unicom AM Aircraft 
122.97500  FAA 122.975 Unicom AM Aircraft 
123.00000  FAA 123.000 Unicom AM Aircraft 
123.05000  FAA 123.05 Unicom AM Aircraft 
123.07500  FAA 123.075 Unicom AM Aircraft 
122.95000 BM CSQ Unicom 122.95 Unicom - Controlled Airports AM Aircraft 

From Appendix 2 of FAA Spectrum Management Regulations and Procedures Manual and 87.173 Aeronautical Frequency Table (See references below)

118.0000 - 121.4000 Air Traffic Control 121.4250 - 121.4500 Govt AWOS/ASOS 121.4750 - 121.5250 Band Protection for 121.5 121.5500 - 121.5750 Govt AWOS/ASOS 121.6000 - 121.9250 Air Traffic Control (Old gnd ctrl freq band) 121.7750 SAR ELT Location training 121.9750 FSS Private Aircraft Advisory 122.0000 - 122.0500 En Route Flight Advisory Service (EFAS) (EFAS/Flight Watch services were discontinued on 10/01/2015 and merged with AFSS) 122.0750 - 122.6750 FSS Private Aircraft Advisory 122.7000 - 122.7250 Unicom - Uncontrolled Airports 122.8000 Unicom - Uncontrolled Airports 122.8250 Domestic VHF 122.8750 Unicom, Domestic VHF 122.9500 Unicom - Airports with full time ATCT or FSS 122.9750 - 123.0000 Unicom - Uncontrolled Airports 123.0500 - 123.0750 Unicom - Uncontrolled Airports 123.1250 - 123.1750 Flight Test itinerant 123.2000 - 123.2750 Flight Test 123.3250 - 123.3750 Flight Test 123.4250 - 123.4750 Flight Test 123.5250 - 123.5750 Flight Test 123.6000 - 126.8000 Air Traffic Control 128.8250 - 132.0000 Operational Control 132.0250 - 136.4750 Air Traffic Control 136.5000 - 136.8750 Domestic VHF 136.9000 - 136.9750 International and Domestic VHF

Common Military Frequencies

In recent years many PMSV stations have moved off of the four older nationwide common frequencies.

243.0000 Aircraft Emergency and Distress (UHF Guard) 257.8000 Air Traffic Control (Military Common) 282.8000 Search and Rescue 255.4000 FAA Flight Service Stations 296.7000 FAA Flight Service Stations 239.8000 PMSV (Pilot to Metro Service - weather advisory) 342.5000 PMSV 344.6000 PMSV 375.2000 PMSV 303.0000 Air-to-air "Winchester" 311.0000 USAF ACC Command Posts Pimary 321.0000 USAF ACC Command Posts Secondary 381.3000 USAF ACC Command Posts 319.4000 USAF AMC Command Posts 349.4000 USAF AMC Command Posts 252.1000 USAF Reserve Command Posts 351.2000 USAF Reserve Command Posts 364.2000 USAF NORAD AICC Primary 380.0000 FAA Flight Inspection/ SMO Ground Personnel 380.1000 FAA Flight Inspection/ SMO Ground Personnel

ARINC En Route Service

The ARINC En Route Service is available to aircraft above 20,000 feet and on the ground at select airports. Base is "San Francisco Radio" except on Gulf Net, Maritime Net and Mex Net which are "New York Radio."

VHF en route frequencies changed effective 04 Apr 2012:

128.9000 Southwest USA 129.4000 Northeast USA / Canada West Coast and Anchorage 129.4500 East Central USA 131.8000 Northwest USA 129.9000 Maritime Net (Northeast Coast USA) 130.7000 Mexico / Carribean 131.1750 Southeast USA 130.4000 West Central USA 131.9500 Pacific Net (West Coast USA and Hawaii)

Aircraft Communications Addressing and Reporting System (ACARS)

ACARS data is used to send messages to and from commercial airlines' aircraft.

Frequency  Type  Tone  Alpha Tag  Description  Mode  Tag 
129.12500 BM CSQ ACARS 129.125 ACARS AM Data 
130.02500 BM CSQ ACARS 130.025 ACARS AM Data 
131.12500 BM CSQ ACARS 131.125 ACARS (High Traffic Areas) AM Data 
131.55000 BM CSQ ACARS ARINC Base ARINC-Americas Base Frequency AM Data 
130.45000 BM CSQ ACARS 130.450 ACARS (High Traffic Areas) AM Data 
136.80000 BM CSQ ACARS 136.8 ACARS AM Data 
136.75000 BM CSQ ACARS 136.75 ACARS AM Data 
136.97500 BM CSQ VDL Mode 2 VHF Data Link (VDL) Mode 2 AM Data 
129.52500 BM CSQ ACARS 129.525 ACARS AM Data 
131.72500 BM CSQ ACARS SITA Base SITA Base Frequency AM Data 
129.35000 BM CSQ ACARS 129.35 ACARS AM Data 

Balloon Operations

123.3000 Common air-to-ground (pilot-to-chase crew), shared with glider ops. 123.5000 Common air-to-ground (pilot-to-chase crew), shared with glider ops. 122.7500 Common air-to-air 122.0000 AFSS Weather requests


Heavy Lift Helicopters

Other Aircraft Frequencies


Marker Beacon

75.0000 MHz

Non-Directional Beacon (NDB)

190 - 530 kHz 1600 - 1800 kHz

Federal Aviation Administration

Air Route Traffic Control Centers (ARTCC)

Each Center is indexed at the ARTCC article.


  • MWARA - Major World Air Route Areas support HF Radio communications to aircraft outside of VHF range.
  • VOLMET - Oceanic Weather

Finding Air Traffic Frequencies

Finding Air Traffic Frequencies

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