Delta Air Lines is preparing to discontinue its marketing partnership with Midwest Airlines after launching a codeshare and frequent flier relationship with Midwest in 2009.
Codesharing and frequent flyer reciprocity between the carriers will end from 7 June "as a result of a change in Midwest Airlines' ownership and business strategy", a Delta spokesman says, adding, "This change will not have a noticeable impact on our customers since Delta serves every destination currently served by Midwest."
Delta announced in March 2009 that it was codesharing with Midwest as an extension of the then long-standing relationship between Midwest and Northwest Airlines, which had partnered with TPG to purchase Midwest in early 2008.
Northwest and Delta merged in late 2008, and the Midwest-Northwest deal was later replaced by the Midwest-Delta agreement.
Regional airline operator Republic Airways Holdings purchased Midwest from TPG in July 2009.
Republic, which last year also bought low-cost carrier Frontier Airlines, is working to unify the Midwest and Republic brands.
A Republic spokesman says of Delta's decision, "the benefits to Midwest from the code-sharing relationship were very limited due to its unilateral nature".