Fast, reliable and a good price. I have used multiple times at BWI and PHL and I have never had to wait long for a shuttle. Book online and prepay to get the best discount.
Pre-pay is the way to go if you don't travel often and don't belong to their frequent parking program. Pre-pay also guarantees you a spot as well!! Employees are always friendly!
Their Frequent Parking Program is excellent, if you travel often. Guaranteed space and all you need to do is show your card. Plus a free day for every four you park.