If Eagle merges with PSA, it will not be date of hire. For one, it is against the ALPA merger policy. Second, about half or more of the captains at PSA would be junior to a lot of Eagle FO's. That is not a fair integration. Relative seniority is the only fair way to do it. That way there is no relative loss of seniority. If you do it relative, then if you are a middle of the list captain at either airline, you will still be a middle of the list captain. If you were a junior FO, you'll still be a junior FO, etc.