How about a B-1? It would have to be flown by Brits as the Yanks use too much O2 at the low level the operate at.
If they get bounced by a fighter, they light the reheats and run for an hour, then see if he's still there! Once had one ask if he could stay and do some "low level" after the exercise part of the sortie and he would meet us again on the next wave!
