There's been a number of successful supersonic ejections of military pilots over the years. It's extremely dangerous and very likely to fail, but it's better than the alternative. The basic idea is a drogue chute stabilizes and slows the pilot.

Whether the same idea could be adapted to a whole plane I don't know, but I would be skeptical of just on the basis that you probably wouldn't trigger such a thing unless the plane has had a substantial failure such that it could overpower any drogue chute.

i'd be willing to believe it's an economics thing more-so than a physics thing.

one could envisage a '747-like' sized plane with many passenger escape-pods similar to the pod from an B-58 Hustler -- but who would pay the astronomic cost for such a ticket?

and similar to what the other person in this thread mentioned : those escape pods won't help during takeoff/landing phases.

There is at least one documented survival at the insane speed of Mach 3: https://theaviationgeekclub.com/bailing-out-at-mach-3-the-in...