This is a scam call from a travel club outfit.  Do not answer their calls.  They also send letters in the mail (federal offense using the US Mail for illegal purposes) stating that you have won 2 roundtrip airline tickets (does not say which airlines) for travel anywhere in the continential US.  When I received the letter, I had only "one day" to contact them before the offer expired!  Let it expire.  You can search the internet for "US Airlines scam" and get more information.  Bunch of bottom feeding a***oles trying to steal your credit card information and then charge you up the a** for things you didn't authorize!  BE VERY CAREFUL WITH THIS PEOPLE!