Originally Posted by Modern Elmo
Aside from unmanned operation, what can the X-37 do that the Space Shuttle can't?
Fly.
As in:
"The Space Shuttle program is down to 3 flights left... STS-132 targeted for launch May 14 will be Atlantis' last flight, STS-134 scheduled for July 29 will be Endeavour's last flight, and STS-133 scheduled for September 16 will be Discovery's last flight, which will bring the shuttle program to an end."
And yes, STS-134
is out-of-sequence... you'll have to ask NASA why.
NASA - Mission Information