For the purpose of this title- (1) "air traffic controller" or "controller" means a civilian employee of the Department of Transportation or the Department of Defense who, in an air traffic control facility or flight service station facility- (A) is actively engaged- (i) in the separation and control of air traffic; or (ii) in providing preflight, inflight, or airport advisory service to aircraft operators; or (B) is the immediate supervisor of any employee described in subparagraph (A); and (2)