on that note, nothing says you have to fly the redeemed ticket. T&C's don't say anywhere that I can't redeem a ticket july 1, redeposit the miles july 2 (for free as a PM), and earn 2x/3x miles.
it is also vague regarding when you have to redeem vs. for what period you earn 2x miles. if i redeem today do i get 2x on spend from Jul 1 to sept 30?
"Double miles offer is valid from 07/01/10 to 09/30/10 ("Promotion Period"). Enrollment and qualification for this offer requires a minimum redemption of 10,000 miles through
one or a combination of Delta channels from the Primary Cardmember's SkyMiles® account. The double miles offer will be applied to the total number of dollars of eligible
spend during the Promotion Period."
As usual, i'm sure we'll see revised T&C's once the brilliant minds in DL promotions (or their subcontractor) figure it out. they sure did come up with many useful examples in chart form of how to multiply by 2 or 3 didn't they. don't worry, i took a screen shot.