There is a potential for drones, but in the case of India - no equipment could read what the mystery thing was.
So if Angels don't have wings, why are they always depicted with them? & if they are depicted then something has wings that once visited earth? Maybe aliens have wings or wing-like flying devices. Airplanes are giant metal birds to primitive people- if something is going on you can't discredit the fact that we'd have an elementary explanation because we too are primitive compared to whatever is actually happening.
The Indian ones could also be some kind of giant raptors that do exist something like Thunderbirds but they were found to be a type of condor.
The humanoids are just weird & most of those videos look fake to me. But this one looks pretty decent.
China is blamed for psychological experiments on the Indians. India always gets ridiculed for its supernatural stance. So if China is to blame then it wouldn't be long until it leaked, but whatever they have why can't they be detected? And why would you go to such lengths...
And then that leaves Mexico and South America to be explained as well...whose responsible for those?
The U.S.? Is it how we spy? Where's Snowden...
or Sal's flying cows 
