Pure windfalls are not an issue with regards to seniority integrations. Where you have a problem is when you have a windfall for one group at the expense of the other. Anything that produces upgrades at one carrier and downgrades at the other (in similar equipment) constitutes the latter. I would argue that putting all pre-1993 Southwest pilots ahead of the #1 seniority AirTran pilot is also in that category (big relative seniorty increase for those guys at the expense of a HUGE hit to the senior Air Tran guys). That's why integrations in the past tend to categorize into narrow body and wide body, and CA and FO. The only possible argument that Southwest has against AirTran is that the 717 falls into a different category than the 737, but given that the pay scales are the same for each, that might be a tough case to make to the arbitrator(s).