Noun
rocket plane (plural rocket planes)
(aviation) A winged aircraft that is propelled by a rocket engine.
In 2004, the SpaceShipOne rocket plane broke through Earth's atmosphere to the edge of space for the second time in five days, capturing the $10 million Ansari X prize aimed at opening the final frontier to tourists. Source: Internet
An X-15 rocket plane drops away from its B-52 "mother" plane. Source: Internet