Currently in the air.
flightaware.com/live/flight/N140SC
Pattern Work at Vandenberg AFB?
flightaware.com/live/flight/N140 … /KMHV/KVBG
From Airliners.net
airliners.net/search/photo.s … rch=N140SC
“N140SC (cn 193E-1067) This TriStar is used to carry the air-launch Pegasus rockets to place small satellites in Orbit. The Pegasus is slung beneath the belly of the TriStar. Two Orbital Sciences X-34s can be seen on the ramp.”