No not normally? 7700 is for an "emergency" 7600 is used for lost comms, and 7500 is used for hijacking of the aircraft. These are standard. It is possible that the crew have inadvertently selected 7700 it does happen but not often and is quickly resolved from a call by air traffic.
No not normally? 7700 is for an "emergency" 7600 is used for lost comms, and 7500 is used for hijacking of the aircraft. These are standard. It is possible that the crew have inadvertently selected 7700 it does happen but not often and is quickly resolved from a call by air traffic.