On hold for nearly a month, the merger deal between Northwest Airlines and Delta Air Lines is in danger of being called off.
Lee Moak, the Delta pilots union chairman, disclosed Monday that the two airlines' pilot groups cannot agree on a list that would define seniority rankings in a merger.
A seniority agreement would determine which planes pilots fly and how much pilots would earn over the course of their careers.
The news, revealed in a letter from Moak to Delta pilots, means the companies will either have to cancel the merger deal -- at least for now -- or proceed with it despite the prospect of a potentially crippling feud within the pilot ranks.
The boards of directors of Delta and Northwest are expected to meet in the coming days to discuss whether the pilots' standoff is a deal killer.
While the Delta and Northwest boards could still go forward, proposing a merger without a pilots' agreement would seem to contradict a Feb. 26 memo that Delta CEO Richard Anderson sent to employees.
In it, he said the company would not complete a merger unless it met all the principles that management set, including that "the seniority of [Delta] people is protected."
The two airlines negotiated a stock-swap deal this winter in which Delta would acquire Northwest and the merged carrier would be headquartered in Atlanta, where Delta is based. The airlines' leadership placed the deal on hold in February to give the pilots time to forge an agreement on seniority issues.