I had an IT bigwig on my flight from SDQ to JFK. She was a Yankee but came over and loves the new Delta. We bent her ear for a while and she told us that the sheer amount of work to combine the two systems has sucked all the time from every computer geek in the company. She also said that as soon once the get the reservation/inventory combined they will start looking at best systems and practices. She also was very interested in upgrading the public website to the 21st century and competing with other model web sites. Last but not least, she was attentive to our complaints and suggestions as pilots and wants to fix our interface and crew IT abilities.
Bottom line is they have a VERY LARGE bite of the sandwich and are chewing it as fast as they can. Add one more point to the plus merger column, Yankee computer systems and know how. (You don't know how much it pains me to say nice things about Yankees...not you NW guys, just yankees in general.)