Equity

urn:aero:airm:1.0.0:ContextualModel:ATMBusinessTerms:Equity

The first aircraft ready to use the ATM resources will receive priority, except where significant overall safety or system operational efficiency would accrue or national interests dictate that priority be provided on a different basis. Equity is ensured for all airspace users that have access to a given airspace or service by the global ATM system.

Source: ICAO