Happy to help with this one,
There are two main types of company frequencies.
- Those which we use to talk directly to the station (i.e. the local company station, the office of the people who load the passengers and baggage).
- The services that can connect us to our dispatchers with a phone link.
Both are totally separate from FAA air traffic control frequencies. They can be found in the band between 128.825 and 132.0 MHz (theoretically it is possible to see this between 136.5 and 137 MHz but I have never seen this in the real world).
At my current company we will call the local station after landing to let them know we are on the ground. This is when we will also confirm the gate assignment, that the gate is open, and make sure they are aware of anything abnormal.
To call dispatch there are two main services, Collins (formerly ARINC) San Francisco Radio and Delta Air Line's Atlanta Radio. You can get your hands on
a chart with the San Fran Radio freqs here. The Atlanta Radio Freq chart is (to my knowledge) not publicly available. Which vendor we use just depends on who your company signed a contract with. We will call the San Fran Radio dispatcher, provide them with a phone number for our own company dispatcher and the phone link is set up. The process is similar for Atlanta Radio. All this is to call your company headquarters. For example, you can talk to your dispatcher about deteriorating weather, the dispatcher can add company maintenance to discuss aircraft issues, or medical consultants in case of a medical emergency.
The best way to find these freqs is to search (128.825 thru 132.0 with AM and 25k spacing). It's often a quiet band, but when something happens, it can be quite interesting.
