Noun
An aircraft formerly operated by the military, but now owned privately.
Any aircraft decorated in military livery for display at airshows etc.
Source: en.wiktionary.org"Commander" is the rank usually reserved for individual Warbird COs (Toreth in TNG's "Face of the Enemy", Sirol in " The Pegasus ", and Tomalak in "The Enemy" and "The Defector"). Source: Internet
The Federation Steamrunner-class, the Klingon Chuq'Beh-class Bird of Prey, the Romulan Raptor-class Warbird, and the Borg Harbinger are all capable of using them. Source: Internet