It’s 15 years since Concorde stopped flying, but for a time in 1979-1980, you could fly Concorde domestically within the U.S. Braniff International operated BA and AF Concordes, re-registered in the US, complete with N-number stickers, and flown by Braniff crews.

Braniff promo video:

Last Braniff Concorde flight from DFW, 1980:

Lots of memorabilia and additional details at the Braniff Pages site:

http://www.braniffpages.com/concorde.html