It was not my 1st time using Book2park. I have been using it for a few years now. I find there services to be most helpful. In February, I had to change airports. My original flight was to leave from BWI going to ORD, that got changed and I had to leave out of National Airport, I called Book2park because I had already paid for parking at one of their locations near BWI. In no time, they had me a location near National Airport, at no additional cost!