Originally Posted by UA_Flyer
Here is a list of US Gateway Travel offices around the country. I have used them (primarily UA) for my personal travel for over 12 years.
I use Gateway Louisville. They are a surly bunch, but they've twice sold me tickets for under $700 when I was on my way to the airport. Moreover, I've never had to pay any change fees (on UA or NW) when dealing directly with the airline.