- Non-noise certificated aircraft: aircraft not certificated against international noise requirements as set out in Annex 16 of the Chicago Convention on International Civil Aviation (International Civil Aviation Organization-ICAO, 1944);
- Chapter II aircraft: aircraft meeting Annex 16 Chapter II specifications;
- Chapter III aircraft: aircraft meeting Annex 16 Chapter III specifications;
- Chapter IV aircraft: aircraft meeting Annex 16 Chapter IV specifications.