Maybe, just maybe DALPA supported the slot swap because it gives DAL a death hold on LGA, which provides pricing power in the NYC market. It provides more revenue opportunity which in turn creates revenue making Delta a healthy, profitable company. That revenue provides job protection. The RJ's will shift & mainline will shift. The never ending shuffle continues.
The RJ's have to be flown somewhere. DAL signed contracts, & they have to comply with them.