T250,
You may be accurate in the statement "most folks", but don't rule out the lack of intelligence on the remainder. That, or those who either are not paying attention or perhaps should just not be allowed out in public.
A number of years back (prior to 9/11) I witnessed someone get past the boarding process only to hear the announcement of the flight details onboard - just prior to door closing and push back.
"Welcome ladies and gentlemen to AAA Flight 123 from X to Y" and then seeing a passenger realizing that they were on the wrong aircraft because they were planning on going to Z, not Y.
Hasty collection of personal effects, up the aisle and out the door.
