Last week I overflew JFK
to the VOR and back out with no problem and that was upon immediate request, (classB). LGA
got me over their runway intersection at 1200' as I had an aerial shoot nearby at a power plant (also class B). So yes, you can obtain passage through controlled airspace in most cases. LAX
has consistently good lighting that one can count on especially when spending nice change $$$ on a chopper is concerned. The airport I always depart from has much in the way of chopper instruction and their pattern work always parallels the active where we have a lot of WN
37's arriving and departing. The good images you have seen I suspect are recorded from choppers, not fixed wing aircraft. At 2500 feet you would need perfect timing, a longer focal length lens and repeated passes. With a chopper you could effectively in 1 hour obtain many arrival/ departure shots just by flying patterns. In addition, lower altitude, no door, shorter focal length, etc...bring your AMEX card!...$500.00-$2500.00/hr depending on type!