CoolP, we were surprised as well that Concorde had such a problem loosing just one of the four engines, but I guess it could not keep up the supersonic speed and thus had to start down into the thicker air where it really burned up the fuel. As for the 707 or 747 shutting one engine down did not have the same impact. You could, depending on the circumstances, continue at a slower speed and go to your destination. Three engine planes had to divert, but the rule was nearest suitable airport which kinda means you can pick which airport you would like to land at but maybe not go all the way to your destination. Two engine planes have to land at the nearest airport.

Lou

P.S., sorry you are having a senior moment... it happens all the time here!  :(