Les billets d'avion gratuits doivent répondre aux critères suivants :

Qualifying airlines are defined by Airline Economics Ltd as companies possessing a current commercial airline operating certificate who are actively providing scheduled and/or charter commercial passenger and/or freight service using large commercial transport aircraft. All airlines must have an airline operating certificate identification number. ACMI airlines are not defined by Airline Economics Ltd as being commercial airlines and will be considered on a case by case basis.