While we all probably won't agree on a time (2 hours MAX seems about right to me), I think that probably 95% of us would agree that 4 hours is too long! In addition, there is no mention of (1) explanations being given to the passengers on-board (2) catering (3) lavatories etc. I agree: this seems like a transparent attempt by AA to head off Congressional action on a Passengers' Bill of Rights.