US Airways joins oneworld March 31 and has a promotion for crediting oneworld tickets to Dividend Miles.
[R]egister with your Dividend Miles number and fly with oneworld partner airlines through June 30, 2014. Each partner airline will only count once, so the more partner airlines you fly, the more miles you earn – up to 25,000 bonus Dividend Miles.
Here’s the earning table:
Registration begins on March 31, and you can register any time up through June 30 to earn miles based on oneworld flights credited to Dividend Miles during the promotion period.
Though the earning table refers to purchases, the terms and conditions are clear that — like the short description above — “You will earn bonus miles based on the number of different partner airlines flown.”
You can only earn a credit for each partner once. American counts as a separate airline for this promotion, but flying just a single oneworld airline (i.e. crediting an American flight only to US Airways) won’t earn a bonus, and though US Airways will be a oneworld airline flights on US Airways don’t count either.