Microsoft Flight Simulator ’98 Slew mode
Before take-off or while in flight, press Y. Then, press [F4] to increase altitude, [F3] to decrease altitude, [F2] to move forward, and [F1] to stop. The cursor keys may also be used to move the aircraft. Press Y to resume normal flight.
The image featured at the top of this post is ©The Legend of Heroes: Trails of Cold Steel III key art / Original