This has to be a scam. It's from "US Airlines". Only a Nigerian would think of that. Second red flag is it was sent to an address that I havn't lived at since 07. My aunt now lives there so she brought it over. Here's the letter...
NOTE: You must respond no later than October 31st, 2012.
I am pleased to inform you that you have qualified for an award of 2 roundtrip airline tickets. Congratulations. These tickets are valid for travel anywhere in the Continental U.S. from any major international airport. The retail value of this award is up to $1,298.00. Certain restrictions apply.
We have attempted contacting you several times without success. This is our last attempt. If we do not hear from you soon, we may need to issue the ticket vouchers to the alternate.