I'd make the jump at 30. So much more opportunity in DEN at UAL. In addition to being a base for WB aircraft, we have a very large and growing presence at the training center and more development on the way with the new land purchase. This gives you career options beyond flying where you can still drive to work. Want to instruct, work special projects, dabble in management - all widely available at some point in DEN. Our WB base is wicked senior and small but because of that there is usually a pretty steady stream of retirements which creates movement downstream and I think there is still room to grow DEN except for the stupid DIA trains. All depends on what you want to do and how ambitious you are with your career. I know one 756 Captain that is senior, bids RSV and UAL is his side gig.