Global Firepower tracks total air service strength for each national power taken into consideration for the annual GFP ranking.
Fixed-wing and rotary-wing (helicopters) aircraft types are factored in from all branches of service (Air Force, Army Aviation, Navy, Marine).
Aircraft types considered include fighters (multirole, interceptors), trainers (basic, advanced), transports (fixed-wing and helos), dedicated bombers and ground-attackers, special-missions platforms, etc.
Aircraft currently under development or on order heading into the upcoming year are NOT taken into account.