This is a video clip of a shock-wave that develops atop a super-critical airfoil (on a Boeing 737-800 in mid-flight from Miami to Denver in February 2022). The sunlight overhead is refracted by the normal shock-wave atop the wing in what is known as the Schlieren effect. The plane itself is not exceeding the speed of sound, however, as air relative to the plane at altitude (40,000 feet at Mach 0.76) moves over the upper part of the wing, a small portion of that air becomes supersonic.

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