Delta is offering double Medallion Qualification Miles for Delta-coded flights booked at delta.com between March 31 and April 30, for travel through June 30, 2008. Registration required.

With three months to fly under this offer, (the next level of) elite status will be a gimme for many. With just 75,000 qualifying miles for top tier, and with elite qualifying miles available to high spenders on both the personal and small business co-branded American Express card, Delta right now is the easiest top tier status to obtain among major US carriers.

On the one hand, their program has gotten increasingly unfriendly. I’ve long said the only reason to focus on Delta is if you’re living in Atlanta and more or less captive. But top tier elites get many of the unfriendly fees waives (such as award redeposits). And this offer substnatially lowers the threshold for getting there.

While I’ve not been a huge fan of Delta lately, I’d rather be a Delta Platinum Medallion than a Northwest or Continental Silver…