Send him the link below if you really want to blow his mind. 100 pages of discussion between pilots, designers, aerodynamicists, FAs, etc.

CliveL was my favorite.

https://www.pprune.org/tech-log/423988-concorde-question.htm...

Or he might like this, reorganised for his reading pleasure: https://paulross.github.io/pprune-concorde/docs/index.html

You can also layer the number of ~'s to skip over intermediary SSH sessions and send the escape to the proper one.

\n~~. will escape the 2nd box you've SSH'd to, not the one it was originated from.

Useful for escaping a screen'd SSH session that you might access through a jumphost.