American and Delta no longer will maintain an interline agreement as of Tuesday, 15?September, 2015. That means they will no longer sell flights / tickets on each other's airline, and connecting passengers will have to collect checked baggage and take it to the other airline's counter to check it in.
American Airlines, Delta Air Lines to end interline agreement 15,Sep 2015
Terry Maxon, Dallas News Aviation Business Blog
Published: September 10, 2015 6:29 pm
In part: “We have been unable to come to terms on an agreement with Delta and, as a result, have mutually agreed to end our interline agreement effective Sept. 15,” American spokesman Casey Norton said Thursday evening. “From that date, neither airline will offer interline services to each other, including the ability to rebook passengers at discounted rates on the other carrier when flight disruptions occur.”
and Norton said the expiration on Tuesday will not affect any interline tickets already purchased for travel on or after that date.
http://aviationblog.dallasnews.com/2...greement.html/
Though this does affect displaced passengers from IROPS because AA will not sell DL tickets or endorse AA tickets over to DL, AA spokesperson Norton claimed AA passengers affected by IROPS would be minimally inconvenienced because “With nine hubs and gateways and nearly 7,000 daily flights, we have more ability to re-route our customers during operational disruption than any other airline in the world.”