Callsign UAL is United Airlines
WHAT AIRLINE IS UAL?
UAL is the ICAO three-letter callsign prefix for United Airlines. When a radio scanner, flight tracker or radar scope shows a flight like UAL123 or UAL45XY overhead, that's a United 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 UAL for its type, registration, route and photo.