- Business jet
- A purpose-built or adapted turbine-powered jet used primarily for private, corporate, charter, fractional, governmental or executive transportation.
- Business turboprop
- A turboprop commonly operated in corporate, charter, private or executive roles.
- Bizliner
- A business or VIP aircraft derived from a commercial-airliner platform, including BBJ and ACJ aircraft.
- Installed fleet
- Aircraft understood to form part of the fleet whether or not every aircraft flew during the observation period.
- Active fleet
- Aircraft recorded as operational or active under the source's methodology during the relevant period.
- Based fleet
- Aircraft physically or operationally based in a stated region.
- Registered fleet
- Aircraft appearing on a jurisdiction's civil aircraft registry.
- Departure
- One aircraft takeoff beginning a recorded flight sector.
- Flight sector
- One flight between an origin and a destination.
- Movement
- A source-defined traffic observation. Airport arrival-plus-departure movements are not interchangeable with WINGX flight sectors.
- Delivery
- A factory-new aircraft shipped or delivered by an OEM during the reporting period under the source's reporting rules.