PI
Piedmont Airlines (1948-1989)
United States
IATA
PI
Papa India
ICAO
PDT
Radio Callsign
PIEDMONT
Example: "PIEDMONT One Two Three" for PI123
About the "PIEDMONT" Callsign
When Piedmont Airlines (1948-1989) pilots communicate with air traffic control, they identify themselves using the radio callsign "PIEDMONT" followed by the flight number spoken in aviation pronunciation. For example, flight 456 would be "PIEDMONT Four Five Six." Radio callsigns are assigned by ICAO and are distinct from the airline's marketing name.