They all called at the same time. I think most of the guys in my interview group and interview prep group all had multiple interviews scheduled. Delta has a 3-4 month wait right now for classes and United is at a 1.5-2 month wait. Southwest called last and I pushed it back as much as possible. I start class at United soon. One delta and one southwest person was at my UAL interview. It is a pretty hectic hiring environment.