And how long do think it would take for the west to agree to be used as a whipsaw against you?
Simple question you must ask yourself. If on the day before the merger, your past CEO said "we're liquidating unless we merge, and if we merge with AWA, this is what the seniority list would look like"
What would you have chosen?
Be careful about thinking that ALPA merger policy is bad. you must consider the "unintended consequences". If you demand DOH in all cases, you will effectively end mergers, and ensure that if you're ever a troubled carrier, you WILL get liquidated. What pilot group at a strong carrier would ever agree to give up seats for guys from a dying on? (for clarity, Im not saying U was definately dying or that AWA was strong, I'm merely pointing out the future concequences of a change in ALPA policy)