I had a business trip that I was returning on this Friday flying usairways. I had a connecting flight in Philly to my hometown. I was at my gate for my flight and boarding was announced. Boarding was hard to hear because the boarder wasn't using a microphone. I went outside and it was dark and there was a bus to take us out to the prop plane. I boarded and went to get to my seat but someone else was in it an d they had the same ticket number I did. They stated they had some issues with their tickets earlier, so I sat down and a flight attendant came over asked me to write my name on a piece of paper, and she asked me if it was a connecting flight. I stated it was from raleigh to philly to my home airport and she seemed like she wasn't paying a lot of attention and walked away. Plane finished boarding and we were in the air. A different attendant made the announcement halfway through the flight that we would be landed in a different airport !!! I ended up on the wrong plane! I talked to the flight attendant about it (obviously to late to return) and she called ahead and talked to a gate agent and told me they would get me squared away at landing ( I was not going to make it to my destination that night!). they put me up in a hotel and got me a flight to an airport that wasn't my home airport because they didn't fly there on Saturday but close enough for my husband to get me. Unfortunately I missed my a committment I had on Saturday. Usairways did book me back in first class when my original ticket was economy and gave me a $100 voucher that could be used within the next year. The gate agent was very nice and helpful. I didn't even think these things happened and would never have thought it would happen to me! I'm trying to decide if I should send thems a letter to provide more information on the situation (to prevent that from happening to someone else - I'm a safety professional by trade so I have some inherent professional interest in preventing this) and ask for points instead of the voucher since I don't see myself flying that airline next year paid. Thoughts?