The company's XB-1 demonstrator jet reached speeds of Mach 1.122 during a test flight ... it's roughly the size of a small fighter jet and has just one seat. It's meant to test various systems ...

It was the first all-weather jet fighter deployed by the U.S., capable of traveling at over Mach 1.7 and climbing to altitudes exceeding 50,000 feet. Each F/A-18 Hornet costs $29 million and is ...