| Abbreviation | Definition |
|---|---|
| CND | Constanta, Romania |
| CNF | Tancredo Neves International Airport, Minas Gerais, Brazil |
| CNH | Claremont, New Hampshire USA |
| CNJ | Cloncurry, Queensland, Australia |
| CNK | Concordia, Kansas USA |
| CNK4 | Transport Canada Identifier for Parry Sound Area Municipal Airport, Seguin Township, Ontario, Canada (IATA identifier YPD) |
| CNL | Sindal, Denmark |
| CNM | Carlsbad, New Mexico USA |
| CNP | Neerlerit Inaat, East Greenland, Greenland |
| CNQ | Corrientes, CR, Argentina |
| CNS | Cairns, Queensland, Australia |
| CNU | Martin Johnson Airport, Chanute, Kansas USA |
| CNV | Canavieiras, Buenos Aires, Brazil |
| CNX | Chiang Mai, Thailand |
| CNY | Moab, Utah USA |
| CNZ | Cangamba, Angola |
| COD | Cody, Wyoming USA |
| COG | Condado, Colombia |
| COJ | Coonabarabran, New South Wales, Australia |
| COK | Cochin International Airport |