bandit, I believe that the first part of this joke refering to just having a HS diploma is just that, a joke. I'm sure no offense was intended and was not put there by the original poster, just copied from an e-mail.
exactly. i fix cars 4 a living and when people come in with strange complaints and wierd noises i tell them " there is a loose nut between the steering wheel and the seat." the reference to education levels was to imply that the pilots were sooooo educated yet wrote a lot less intelligently than u would expect. we can all learn a lot from the techs in this joke who were able to make the best of an awkward situation. nuttin but luv 4 u guys.