Callsign QTR is Qatar Airways
WHAT AIRLINE IS QTR?
QTR is the ICAO three-letter callsign prefix for Qatar Airways. When a radio scanner, flight tracker or radar scope shows a flight like QTR123 or QTR45XY overhead, that's a Qatar Airways aircraft talking to air traffic control.
Spot one yourself: open the live scope, enter your postcode, and tap any blip whose callsign starts with QTR for its type, registration, route and photo.