At the numbers they are talking about hiring over the next couple of years, I would think new-hires to the A320 would be a possibility. I doubt the 737 since the airframe is headed for the boneyard over the next couple of years. As for the widebodies, I suspect there are plenty on property already who want those slots. But I suppose anything is possible.

One never knows about the future of the 190 fleet. A friend on the inside there got directly from Scott Kirby that a fleet of 15 airplanes wasn't sustainable in the long term ... he said the fleet would either get bigger or go away over time. Anyone's guess how that plays out vis-a-vis capacity issues, minimum fleet count, and the usual industry turmoil.