No matter how its done before purchase, all seniority should be assigned as date of hire for those on property from the date of purchase of Colgan and Mesaba by Pinnacle.
Why? Because I'm sure we can all agree that the lists should've been combined immediately. If they had been done as such, DOH is how the pilots would've been placed on the seniority lists. Plus it, mostly, absolves the problem of the allocation of the Q400s.
How many pilots do Pinnacle and Colgan have each currently? How many are remaining on respective lists from when the date the purchase was announced?