Pilot Reference
Quick lookups for squawk codes and the phonetic alphabet.
Squawk codes
Common transponder codes used in flight simulation. The three emergency codes (7500, 7600, 7700) are universal and trigger immediate ATC attention.
Aircraft is being hijacked or under unlawful interference.
Loss of two-way radio communication.
Any emergency situation requiring immediate attention.
Standard VFR squawk in the United States and Canada.
Standard VFR conspicuity code in Europe and most ICAO airspace.
IFR transit code when no discrete code has been assigned (ICAO).
Standard code for gliders not in contact with ATC.
Firefighting aircraft operating at the scene of a wildfire.
SAR aircraft operating on a mission.
Reserved for military interceptor operations. Never select on a civil aircraft.
Phonetic alphabet
The NATO/ICAO phonetic alphabet. Used to spell letters clearly on the radio.
Numbers
Pilots pronounce 3 as "tree", 5 as "fife", and 9 as "niner" to avoid radio ambiguity.