I know what comes to mind at the thought of Gremlins, but I am sure none know better then us, that Hollywood, should not be trusted most particuarly in its account of things supernatural.
Gremlins are indeed nothing like those portrayed in the popular movie. They are thought to be air elementals, and overall beneveloent and with good intentions, though a touch mischevious.
One might by chance catch a glimpse of one, if flying on a moonlit night if you are by a window seat fix your gaze out on the wing and look for slightly brighter spots of moonlight glistening off the metal, these are most likely gremlins whom have come along for the ride.
If your secound sight/third eye is particuarly senseative you might be able to see them walking acorss the wing or sitting on the edge with thier feet dangling.
If you see them, you should not be afaird but send them blessings and good wishes, they can be enjoyble company and useful friends.