Delta Offering Mileage Bonuses`

Delta + Northwest offer 2,500- to 50,000-mile bonuses on select flights

Flyers who play the mileage accumulation game are having a field day by flying the now-merged Delta and Northwest airlines' current bonus offers -- or by not flying at all but applying for an affiliated credit card. There are a few hoops to jump through, including online registration for each offer, and you do need to check the fine print. Thanks for Frequent Flyer Bonuses for the tip about these offers:

Transatlantic nonstop roundtrips between North America and Great Britain earn up to 50,000 bonus SkyMiles (BusinessElite/Business Class (fare classes, J,C,D,S and I on Delta-coded flights and J,C,I, and on Northwest-coded flights) and 25,000 bonus miles for paid Premium Economy Class (fare classes Y, B, M on Delta-coded flights and all Northwest-coded flights) to or from London (Heathrow or Gatwick), Manchester (MAN) or Edinburgh (EDI). Online registration is required), and then book online until June 30, 2009.

There don't seem to be a lot of strings attached to the new offer of 2,500 bonus SkyMiles on flights with Delta Northwest or their commuter partners Northwest Airlink (Mesaba, Pinnacle, and Compass) or Delta Connection. Online registration is required, and then bookonline online by June 4, 2009.

Up to Triple Elite Qualification Miles are being given for every Delta and Northwest flight through June 15, 2009. Premium fares (Delta fare classes J, C, D, S, I, F, A, Y, B and M) good toward Medallion qualification status. Discounted Economy fares (Delta fare classes H, Q and K) earn double miles Online registration is required, then book online until June 15, 2009.

Earn double SkyMiles by flying Delta or Northwest nonstop between Minneapolis (MSP) and Chicago O'Hare (ORD) or Chicago-Midway (MDW). Online registration is required, then book online until May 31, 2009.

Nonstop roundtrip travel between Cincinnati (CVG) and Atlanta (ATL) and Newark (EWR) , Baltimore (BWI), Philadelphia (PHL), Charlotte (CLT), Phoenix (PHX), Dallas/Fort Worth (DFW), San Diego (SAN), Denver (DEN), San Francisco (SFO), Kansas City (MCI), Seattle (SEA), Los Angeles (LAX), Washington National (DCA) or New York/LaGuardia (LGA) can earn up to 25,000 bonus miles if that make the entire series of five roundtrip flights, The first and second roundtrips net 3,000 each, the third 4,000, the fourth 5,000 and the fifth 10,000. Online registration is required, then book online.

And finally, sign up for the American Express platinum card affiliated with Delta and earn 20,000 SkyMiles, including 5,000 toward Medallion status.