This sounds like a decent deal to me, got it in an email from USAir.

I don't know if it has to be a USAir Mastercard or not?



US Airways Vacations invites you to enjoy the luxurious Wynn Las Vegas Resort and Country Club this summer with this exclusive offer.
Book your air and minimum 3 night vacation package at Wynn Las Vegas using your MasterCard® card by August 22 to receive:

$50 off your package
$100 MasterCard gift card
$150 Dining & Entertainment credit at Wynn
A complimentary room category upgrade
Invited Guest Check-In
Use promotion code DMWYNN at time of booking.