The airport fire station occupies a large structure just inside the western gates to Los Santos International Airport. 4 south-facing appliance bay doors are visible in the single level part of the structure and are permanently closed. The larger part of the structure appears to have 2 levels and has 3 roller doors that do not appear to be for appliance bay access.
A burnt out plane can be seen to the west of it and is obviously used for training, but despite this firemen can't be seen using this unless you set it on fire yourself.
No appliances are present around the station.