Callsign ASA is Alaska Airlines
WHAT AIRLINE IS ASA?
ASA is the ICAO three-letter callsign prefix for Alaska Airlines. When a radio scanner, flight tracker or radar scope shows a flight like ASA123 or ASA45XY overhead, that's a Alaska Airlines aircraft talking to air traffic control.
Spot one yourself: open the live scope, enter your postcode, and tap any blip whose callsign starts with ASA for its type, registration, route and photo.