The other program UAL has is the Lufthansa flight instructor program. If you are a CFI, you apply to be a CFI at the LH flight training school in AZ. If selected, then after you get your 1500/ATP, you flow to UAL narrow body...you don't go to a regional at all. I don't know all the details. The program was announced in Aug 2016 and has already started.
(Cape Air has flow through to Jet Blue...not a major, but you may want them...)