I drive a limo. I've been to JFK and Newark. I've used their cell phone lots and have had no issue. However, when I went to pick up a client at Philadelphia's International airport, I was hit with a $100 ticket. The officer told me that the area was only for personal vehicles and that there was a zero tolerance policy for taxis and limos. I was told that I had to park in a lot.
If their main concern was security and congestion, wouldn't it make more sense for them to keep more vehicles outside of their main area? I'm just venting as there were no clear signs directing me to do differently at the time.