on UFOs

watching passenger jets approach sac international airport i marvelled at the shapes they made against the sky while their lights slit thru the air at odd angles no wonder these planes are sometime mistaken for UFOs it occurred to me that if an advanced alien civilization were indeed cruising in our skies wouldn't they just make their craft look like ours wouldn't they use camouflage and know how to blend in i mean even we know how to make a tank look like a shrub from the air