At the conclusion of a six-month US Department of Justice (DoJ) investigation, approval of the merger of the two airlines was allowed. It could be a year or two before consolidation is completed and the resulting entity operates as one.

A number of challenges had to be met before Delta Air Lines could complete its acquisition of Northwest Airlines, including the okay from the DoJ. Stockholders had to agree, which they did, and pilots for the two airlines had to settle differences regarding matters of seniority and more.

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