I was flying from Phoenix to Baltimore. I was at the airport with plenty of time before the flight and I did not have any luggage to check-in. As I was boarding, the gate attendant asked if I wanted to check-in my carry on because she wasn’t sure that it would fit in the overhead storage compartment but I assured her that I’ve travelled with the same carry-on several times without any problems, and I know that my carry-on is compliant with regulation size. The gate attendant was okay with my explanation and I proceeded to board my flight. Once onboard, I was looking for space to stow my carry-on but most of the overhead compartments were already closed and the ones that were open did not have room in them as they were already used by passengers who have boarded ahead of me and had placed their items there. One of the flight attendants called the gate and asked if they could check-in my carry-on but I explained to her that I did not want to do that because my carry-on contained fragile business equipment that could not be checked-in. Instead of moving soem items around to make room for my carry-on, she told me that I needed to get off the plane stating that I was holding up the plane and if I wasn’t going to check-in my luggage that I should go back to the airport and try to get on another flight. I did not want to cause any trouble so I got off the plane and went back to the US Airways desk where I was informed that the next flight to my destination leaves 5 hours later and I didn’t have much choice but to take it. Needless to say, this made me upset because I had planned on being home with my family by 5 PM that day, instead, I did not get home until midnight. My family had made arrangements to pick me up and my husband had taken time off from work. I had already returned my rental car so I was stranded at the airport in phoenix for 5 hours with nowhere to go. I contacted US Airways with this complaint but it's now been 8 months and I have not heard from them at all. Very disappointing!