Nobody in the previous two classes has held ORD out of class. There are at least five from my class that have it as their standing bid, including me. I may change it to IND because of the much lower cost of living.
With upgrades senior/junior bases on the S5 side are changing pretty quickly so your milage may vary. ATL and DEN will likely stay senior for quite a while but what is posted here could change pretty fast.
I'd suggest avoiding the lateral move BS. There are a lot of us here. Many by choice.