If you've ever dropped a French fry at the beach, you know that's not true.

A flock of migratory birds could very easily be cruising at that height, and if in a fast moving jetstream or similar could be moving at hundreds of miles an hour when referenced to a ground based source.

That came as news to me. Some fly at 11200m/37,000 feet.

https://en.m.wikipedia.org/wiki/List_of_birds_by_flight_heig...