Callsign MSR is EgyptAir
WHAT AIRLINE IS MSR?
MSR is the ICAO three-letter callsign prefix for EgyptAir. When a radio scanner, flight tracker or radar scope shows a flight like MSR123 or MSR45XY overhead, that's a EgyptAir aircraft talking to air traffic control.
Spot one yourself: open the live scope, enter your postcode, and tap any blip whose callsign starts with MSR for its type, registration, route and photo.