I booked a flight from LAX to Cleveland, Ohio. I had to connect through Denver and was scheduled to arrive in Cleveland at 12:30 AM for a one day business meeting which began at 7:30 AM. When I arrived in Denver, they told me the flight was cancelled and offered to fly me to D.C. and then to Cleveland which would get me into Cleveland after 8:30 AM. I told them Frontier had a flight which would get me to Phoenix and then to Cleveland at 7 AM but they refused to pay for the Frontier ticket. They also refused to allow me to use the United lounge while I waited for the flight to DC and also refused to upgrade me to First Class. They gave me a $200 credit for future use which is truly pretty worthless to me. Is this standard operating procedure? Do they owe me anything else for the tremendous inconvenience, for making me late to the meeting, for the fact that I wasn't able to get even a few hours sleep? Also, the cancellation was not due to any weather-related issues. Thank you for the information.