When I purchased the ticket at united.com, I decided to pay more to get a better flight schedule. The airline changed my flight schedule from 7:30am to one at 5:30am by email because of "flight cancellation". After spending more than an hour on the phone, I changed to another flight at 7:59am. The same situation also happened to my wife's trip with UNITED AIRLINE. In my opinion, this is an unreliable airline as it will change your flight schedule at your cost for their PROFIT. This new UNITED, after merged with Continental, is the worst airline in my list. I will avoid using it!