I have a client requesting a flight at 1500-2000'. I tried to explain that there is a 400' ceiling for drones in the U.S. (It's not near another structure, so flying near a tall structure doesn't apply). He insists it's possible with FAA approval. Am I missing something here? This is near a fairly congested airspace near a large metro city with multiple large airports. I've never heard of a commercial drone flight in the U.S. above 400' unless it's next to a tower which exceeds 400'. Which this isn't.