Aviation Boeing 747 vs. SR-71 Blackbird vs. New Horizons Deep-Space Probe Commercial airliners are fast. A Boeing 747 can hit speeds of up to 550 mph. Spy jets like an SR-71 Blackbird are even faster. They can travel at over three times the speed of sound, somewhere around 2,700 mph. But how... Matthew BlockusSeptember 1, 2015