EghtesadOnline: Ask a harried air traveler about the basics of modern flight, and you’ll probably elicit surprise when they discover commercial airplanes fly only as fast as they did in the 1950s. Given the range of aerospace advances in the past half-century, plus the technological leaps in almost every other area of human endeavor, it seems reasonable to ask: Why can’t we fly faster?

EghtesadOnline: Two aircrafts were traveling so fast — quicker than the speed of sound — and so close together that the shock waves emanating from the craft began to merge… and NASA was there to capture photographic proof.