Let's save time. It's a 'good thing' to fly dal customers on non-dal aircraft. 'All scope agreements between dal and dalpa have been for the advancement of the dal pilot career'. The last JV settlement netted the dal pilots a whopping ~$30m! What's not to like here?

Since the 90's and 'the rj fleet will allow a nimble marketing' concept sales job, flying dal customers on non-dal aircraft has kept dal in business and saved the dal pilot career.

How's that. Now, about that PS trade...

edit: even more important... the other side in these agreements finds no problem in violating agreements for pennies on the dollar.