A few weeks after American AAdvantage announced the details of their transatlantic bonus in premium fare classes, Delta SkyMiles launched a similar promotion. Delta SkyMiles members who fly BusinessElite or full-fare economy between the U.S. and London Heathrow through Jan. 31, 2013 can receive 100,000 bonus miles for three roundtrip flights. Register and earn 15,000 bonus miles on your first eligible roundtrip flight, 35,000 bonus miles for your second roundtrip and 50,000 bonus miles for your third and subsequent roundtrip flights in BusinessElite (J, C, D, I or S) or premium economy (Y, B or M) on Delta marketed and operated or KLM marketed and Delta operated roundtrip nonstop flights. Travel may originate or terminate in other cities as long as a qualifying nonstop transatlantic flight to or from London Heathrow is included. Visit http://www.delta.com/london100k for more information and to register. Members must register by Jan. 15, 2013 and complete travel by Jan. 31, 2013.