Dutchess County Airport's role has changed a lot since I was born. It used to fly commercially from New York City, amongst other places in the region, but it doesn't anymore. Now it's private aviation, whether people flying their own planes or taking lessons (small jets, twin-engine aircraft, and helicopters are mainly what you see on the runways and helipads here). Therefore the only people who use it these days are doing it for their own leisure or for education purposes, though I suppose business could be involved if that's the nature of the private flight, but all flights are in fact private. I remember when it was also a lot more active, but now you only hear planes overhead every now and then.