Join US AIrways Dividend Miles program before December 31 to earn 1000 miles by using promo code NMCB.
Sign up for the US Airways Grand Slam promotion that ends November 14.
Sign up for Goldpoints Plus and receive 2000 Goldpoints for free.
Exchange your 2000 Goldpoints for 250 United Airways miles.
BONUS: This counts as 1 hit for the Grand Slam promotion. If you get four hits, you earn 4000 bonus miles.
Your US Airways account will now have 1250 miles for free!