[ABE]

It could be any kind of insect.

Typical video is 30 frames/second. Most insects beating wings can far outpace that, so what your seeing is the distance the bug flew in 1/30th sec (the striaght line) and the two sets of "fins" are two strokes of the wings.

At least that's my guess.

[rimtop56]

Plus, if it has been a missile, wouldn't it have blown up when it hit the ground?