[UPDATE, Jan. 24, 2018: Delta Air Lines said it reached a new deal with American Airlines to handle customer reaccommodation during bad weather and other disruptions. "The new ticketing and baggage agreement will allow both carriers to rebook customers impacted by irregular operations on one another's flights," according to a Delta statement. A Delta official explained that the new deal is not a "true interline" pact because it does not include "things like fare combinability for travel agency and third party sales."]

American and Delta