Wont happen for a while. New aircraft with new crews needs to do proving runs.
All these different types of aircraft coming on the fleet is going to create a nightmare.
From a Aircraft maintenance standpoint it is going to suck big time. More schooling, more quals to maintain, more crap to keep up on. I was told by one of our training instructors that AA is going to cut back on QA, give the short version on the gen fams, integrate or in other words eliminate the separate avionics department. With all these new aircraft coming on board we really need to improve our way of maintaining a wide range of diverse fleet.
This is not the way to do it. This may look pretty from looking out the window at the terminal but behind the scenes it sucks.