Pioneer Rocketplane was an aerospace design and development company intent on developing affordable manned space flight. The company is most famous for advocating a horizontal takeoff, turbo-jet and rocket propelled, aerial-refueled, rocket plane concept called the Pathfinder. The company still exists, but is no longer in operation. Pioneer's intellectual property is now owned by Rocketplane Limited, Inc., however Rocketplane Limited does not employ any of the principals of Pioneer Rocketplane.