Must have been a long time ago, the EG has been on display for a long time.
I was there about a year ago, the parking is free, we parked right in front of the entrance. It is a great museum. Besides the Enola Gay, they have a Concorde, Space Shuttle, Saturn V engine, and an SR-71. The SR-71, it's last flight was from LA to Dulles in an hour and 4 minutes.
I've had some museum views from the house this weekend. The Collings Foundation Wings of Freedom tour is at the local airport. The B-17, B-24 and B-25 have been flying past, giving rides.