Planning on flying with United Airlines soon? Know your rights (all three of 'em). Download the official United Contract of Carriage (you'll need a PDF reader). Print it out. Bring it to the airport and show it to any employee who gives you guff.
(Me, I've had mostly positive experiences flying United, except for a bomb scare at LAX, and that wasn't anyone's fault really, but the communication between crew and airport should have been much much much better organized. There was no reason why passengers should have had to wait onboard a stuffy plane for 90 minutes while it was parked safely on the tarmac and all other inbound and outbound flights were grounded. We were nowhere near the gate; where would we have run off to?)