The aircraft commonly called the "TR-3" on this board and /x/ is actually called the SB-3 Ghoul.

It has a modular bay that can be configured for bombing or surveillance missions (turn-around is only 12 hours!) but has so far only been deployed for surveillance.

It is NOT an anti-gravity drive, but it is certainly exotic. The engines run on liquid hydrogen and there are two KC-135 tankers that have been converted to carry the hydrogen for refueling if the mission requires it.

http://icecube.lbl.gov/