The U.S. XW7 fighter jet, a fictional aircraft, does not exist in reality. However, if you are referring to an actual fighter jet like the F-22 Raptor or F-35 Lightning II, the F-22 has a top speed of around Mach 2.25 (approximately 1,500 mph), while the F-35 can reach speeds of around Mach 1.6 (about 1,200 mph). If you meant a different specific jet, please clarify for accurate information.