In which year was the first supersonic flight by an airliner?

Misunderstanding. To me, "airline/airliner" implied routine flight, where most of the trip is above mach 1. I didn't expect the "flight" to be way shorter than the Wright brothers 1st flight. Whose to say an airliner didn't crash at mach 1.

TestyAlien3443, You are right . A 16 second research dive is not a flight .