It is that creepy grem,linb dude from the Twilight Zone "Terror at 20,000 Feet" starring William Shatner. He was on the wing of the plane trying to make it crash by pulling up the fuselage and getting to some critical circuitry. Shatner, a former mental patient, finally shoots the gremlin (no one else ever saw it, so they assumed Shatner was still crazy), thereby saving all the passengers.