Fair point, pwalhx. But it does show that pax do not forget.
I have not had many occasions to chose a particular USA carrier, since a grim experience (both check-in and cabin) since I was on them in the mid-90s. So I presume they are better now - but in the opportunities I've had to chose them and find out - they've not been on the list.
I have only once had to meet an unaccompanied minor (ny neice then aged 12) from a long haul flight but the airline made a hash of the handover and if anyone mentions UMs, then I tell the story as a warning.
All companies have to learn that you have to be good all the time and to rectify faults rapidly. In the biggest recession the West has had for 90 years - there are no second chances.