In the past when negotiating work rule changes both sides would have access to Carmine to look at how changes would effect rotation construction and could derive costing data. A surprising number of pilots try and apply a workrule change to the current bid package to measure gains but that has zero validity since changes in rigs will result in vastly different rotation solutions. A example is 4 day trips with a 30 hour layover. Not long ago they often paid 18:30 but tended to be very easy trips. We added the 5:15 ADG and 4 day trips with a 30 hour paid 21 hours however on the 3 flying days generally became much harder as they crammed flying into those days.
A 5:15 MDG verses a 5:15 ADG will result in significant changes to rotation construction. Overall I think it would be a good change however it’s going to be very expensive when costed out. It’s also going to result in the company needing to put more time in the first and last day of a rotation reducing commutability.