Domestic traffic will return far sooner than international (which is also going to put UA in a tough spot). But rather than respond to AA on the international side, DL should focus more on its own domestic flows.

Going forward, there will be the new terminals at SLC, LGA, and LAX that will all help improve connection experiences. The A220s should provide more flexibility on routes, and swapping out most of the CRJs to at least 700/900s would be nice. Most importantly, DL should continue doing what they are doing, which is offering a product people actually want to fly.