Two year old info here, but they passed out a sheet during the week of Indoc and we all ranked each base we wanted in order of preference. I was a cadet and in the front of the class so I had “first dibs” … but not really much to bid on. I think they ran the actual vacancy bid for the company, then ran us afterward and assigned us where they could. At the time you could only really count on ORD and DTW. That month about a dozen happened to get DEN because they decided to grow it a lot for the summer. You should have full website access by the time you get to class, so you can see the vacancies and seniority for the previous months’ award. The seniority tab on the pilot recruitment website is the easiest way though. Anything with a 2021 date is a potential option. I haven’t looked at it in a while; with the exception of ORD it’s actually really interesting to see all those 2021 junior dates. Neat.