Flightglobal’s World Air Forces directory uses abridged numerical information sourced from it’s MiliCAS and HeliCAS databases. Published as premium products, these provide subscribers with detailed fleet information on military aircraft types, in the majority of cases down to serial number detail. Fleet entries are split into the following categories:
ACTIVE: Aircraft in day-to-day use. For Soviet-era types where only summary information is available, this also includes some non-operational platforms.
ORDERED: Aircraft under firm contract or the subject of formal purchase agreements. This category also includes some orders which have yet to be confirmed with these marked by an asterisk.