U.S. Has New 4,499 Mph Aircraft

WASHINGTON – The U.S. Army will in conjunction with NASA test a new aircraft capable of reaching speeds of up to 4,499 Mph.
The supersonic X-51A WaveRider test, which takes just 5 minutes (300 seconds) because of the enormous speed, will be manned and unmanned.
The X-51A Waverider on the...