Labels:airplane | dialog box | hakham | plane | sky | tv | window OCR: X-15 Launched into Flight About the X-15 The X-15 was designed in 1958 t test how fast and how high airp lanes could fly This single-seat roc ket-engine aircraft didn't take JJO from land was launc hed into flight from an airborne -52. So that it would withstand temperatures of over 1,200 degrees (649 degrees C the craft was covered with a newly developed ma terial ma de f a nickel alloy By the end of the X-15 testing program in 1968 many records had been set incl luding speed of Mach 6.72 and an altitude of 314,750 feet or nearly 60 miles (96 km)! 15Iaurrhad aircraf inta