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Delta Air Lines (Atlanta) and Midwest Airlines (Milwaukee) today announced a new alliance agreement for reciprocity of the two airlines’ frequent flyer programs, joint marketing efforts and expanded access to airport lounges throughout North America. This agreement replaces the previous agreement between Midwest and Northwest Airlines which is being absorbed by Delta. The agreement also includes code-sharing which should commence in June 2009. Meanwhile AirTran Airways (Orlando and Atlanta) continues to add routes from Midwest’s Milwaukee hub.