Two have been manufactured for flight, one for aerodynamics testing. I imagine they fly one and perform refurbishment and re-equip the second one while the fir

Two have been manufactured for flight, one for aerodynamics testing. I imagine they fly one and perform refurbishment and re-equip the second one while the first is flying. https://en.m.wikipedia.org/wiki/Boeing_X-37 https://en.m.wikipedia.org/wiki/Boeing_X-37