Three decades ago ALPA decided to flow commuter pilots from Ransome Airlines onto the Pan Am seniority list with their Ransome date of hire. They came over on the A-scale while all of the regular Pan Am newhires were on the B-scale. Ransome was renamed Pan Am express and the commuter date of hire was still honored as the pilots 'flowed' onto the Pan seniority list ahead of the Pan Am hires.
Many of these folks ended up on the Delta seniority list after the demise of Pan Am.
The Comair pilots tried to hijack the Delta seniority list in a similar fashion with some encouragement from ALPA. The Deltoids stood firm however and it didn't happen.