https://upload.wikimedia.org/wikipedia/commons/f/f5/FA-18_Hornet_breaking_sound_barrier_%287_July_1999%29_-_filtered.jpg
U.S. Navy F/A-18
<https://en.wikipedia.org/wiki/McDonnell_Douglas_F/A-18_Hornet> flying
faster than the speed of sound. The white cloud is formed by decreased
air pressure and temperature around the tail of the aircraft (see
Prandtl-Glauert Singularity
<https://en.wikipedia.org/wiki/Prandtl-Glauert_Singularity>).^[1]
<https://en.wikipedia.org/wiki/Sound_barrier#cite_note-1> ^[2]
<https://en.wikipedia.org/wiki/Sound_barrier#cite_note-2>