This is a replica of the Micro Craft X-43 and its carrier, a Boeing B-52 Stratofortress. The carrier is based on the B-52 Stratofortress of user @Falkenwut.

Steps for Flight: Takeoff (VTOL down for flaps) and pay attention to the attitude of your carrier because the aircraft is only carried on one side of it and it is NOT balanced.

Reach 43,000 ft for deployment. Toggle Activation Group 1 to detach from the carrier and activate the Pegasus booster;

Reach 95,000 ft and 3,300-3,400 mph for booster detachment. Deactivate Activation Group 1 to deactivate the booster, and toggle Activation Group 2 to detach from the booster and activate the scramjet.

Note: Do NOT detach from the booster too late or your scramjet won't be able to suck in enough air at a high altitude.