United has the worst Customer Service culture of all the U.S. airlines. A year after the Continental acquisition by UA, as my wife and I were boarding a UA flight, the FA at the entrance to the plane insisted that between the two of us, we were allowed to have only one carry-on luggage since "the flight was full!" I had Platinum status and therefore, we were among the first group to board. When I protested, the gentleman threatened to cancel our reservation. A complaint to customer service later on earned us a miserly $150 travel certificate. Since then, we have always avoided traveling on United.