Airwolf is a port of the classic arcade shoot 'em up with a few improvements, including an actual story. So of course, Acclaim ignored it and instead released a boring flight simulator.
Sound Test#
On the title screen, press Up, Down, Left, Right, A, B, A, B on Controller 2, then press A + B + Start on Controller 1.
Stage Select#
On the title screen, press Up, Down, Left, Right, A, B, A, B on Controller 2, then press A + Start on Controller 1. The intro will play normally, but after the intro, the game will jump to a stage select screen.
(Source: CaH4e3)