an interestign read from barons:

Why Delta?s Pilot Deal Could Be Bad News For Southwest - Stocks to Watch - Barrons.com

highlights include:
... we estimate that this would result in cost increases over the current contract of $196 million in 2015 and $356 million in 2016...

and:

Based on our 2016 earnings forecast adjusted for higher pilot costs and an assumed 3% wage increase for non-pilot employees, the change should result in ~$600 million in lower profit sharing expense.

so, in the first two years we are in the plus column at 552 mil, in 2016, the company makes back 600 mil. more than paying for its first two year investment. I wonder how much the company saves on profit sharing in 2017 and beyond?