I received the same letter by mail. Called the number and they tried to get me to come down to listen to some sales pitch. She wouldn't hang up, so I did.
Typcal hook - use a company name very similar to a legitimate one. US Air should sue US Airlines for intending to deceive.
The real name of the company is Go Discount Travel.com. A small time scam network....they require you and your spouse to attend a presentation. Very similar to time-share pressure sales back in the 1980's. They lock you up in a room and practically block you from leaving....