Delta CEO Sees Lengthy Battle Over Fate of Aeromexico Alliance

Delta Air Lines Inc. is prepared for a lengthy battle over the US government’s planned suspension of its transborder partnership with Grupo Aeromexico SAB, which regulators have said should wind down by October.

The proposed breakup of the relationship has set the two carriers at odds with the US Transportation Department, saying the plan punishes the partnership for Mexican government actions beyond their control.

“It will be a long, drawn-out process,” Delta Chief Executive Officer Ed Bastian said in an interview. “We have a lot of parties engaged at this stage, and a lot of customers are engaged ...