FWIW, The day of the Malaysian airplane disappearance (a Friday), there was a VERY low flying helicopter over my mom’s house (Allegheny County). I just saw the shadow, and felt it, and heard it from inside. Shadow covered width of driveway. I have no idea what they were doing, except I thought it was either going to land or crash next door.
Can you imagine when drones become more commonplace, and they start hovering around too.. How spooky/creepy that will be :-/