Callsign ICE is Icelandair
WHAT AIRLINE IS ICE?
ICE is the ICAO three-letter callsign prefix for Icelandair. When a radio scanner, flight tracker or radar scope shows a flight like ICE123 or ICE45XY overhead, that's a Icelandair aircraft talking to air traffic control.
Spot one yourself: open the live scope, enter your postcode, and tap any blip whose callsign starts with ICE for its type, registration, route and photo.