866-509-2843

I received a letter--no return address, no contact info inside the letter--with just a photocopied logo of "US Airlines" as the header and the letter stated I had won 2 roundtrip airline tickets worth $1400. It said they'd attempted to contact me several times and that I needed to call that number to claim my prize. It's a scam. I have not entered any contests and no one has tried to contact me.

Did you try calling the number?  I flew US Airlines last year.

I got the exact same thing.  I had not entered any contest and the envelope was hand addressed with no return address.