okay, Im dumb. what's Aurora? besides the name of my landscape lighting business...
Aurora -- allegedly the next "secret" airplane in the USAF inventory. In 1990 Aviation Week and Space Technology wrote an article laying out the evidence for its existence. Possibly a hypersonic reconnaisance plane. Its existence is still officially denied.
Remember the F-117 Stealth "Fighter" was operational with nearly 100 planes and 3 crashes to its record before the USAF ever acknowledged its existence.