This scenario is unlikely as their are many reasons working against it.
1. Even if you combined the types you would still have to seperate out the International pilots from the Domestic pilots or you would have to operate all pilots under domestic rules which would kill your efficiency you just tried to gain.
2. Even if there were some efficiency to gain considering number 1, the cost would increase because the 767-400's are on a different pay scale then the others so you would have to (ALPA wouldn't allow it otherwise) increase the pay of all of your reserves. i.e. pay them at the 400 rate, or some compromise rate that is higher than what they are paying their 757/767 drivers now increasing the cost of maintaing your reserves.
3. The 767-400 requires differences training that all current 757/767 drivers would have to be sent through, greatly increasing the cost of combining the fleets.
G4G5
The cost of training and the associated training time would be minimal. I know at AA the FAA mandated MD80 differences training when we aquired the TWA MD80's. AA had approx 275 MD80's and we were adding just (approx) 30 MD85's that had dual FMS's and EFIS, hardly seemed worth it. The training was 1 extra class day added to your normal recurrent cycle, with in 9 months everyone was qualified. The differences from a 767-400 to a 763/2 are no worse then going from a steam gague MD80 to an all glass MD85. One day of class time is not that big a deal for a company to swallow if it means getting all the 767's on one bid category and the efficiences associated with it.
At DAL intl vs dom is not that big a deal only ATL would be effected. For example, JFK/NYC has no DOM 757/767 bid status so any reserve pilot based in NY would already be Intl only. The last time I checked SLC 757/767 was Dom only.
It also depends if the intl and dom pay survives the ch11 or voluntary give backs. I know at AA mgt has been trying to get rid of the intl pay on the 737 for some time. At AA their is no intl pay for the MD80 flying to the Carib, Mexico and Canada. What do you think Jetblue does? They don't have an intl divison for their San Juan/carib/Latin routes. If it goes to Ch11, DAL mgt will be sure to bring this to the attention of the arbitrator.
4. The current 767-400 pilots are probably not going to want it as it would mean a reduction in pay, and the possibility that they would have to fly the 757/767 routes where there is substantially more domestic, "short" hop flying.
Their are so few 764 pilots that their opinon would hardly phase the masses. If the current 762/3 pilots stood to gain $$ or an improved Q of L by flying the 764 then the union would consider it wash. This is all moot because IMHO if it goes to CH 11, DAL mgt will fight to eliminate the different pay categories along with intl and night. I would look for something along the lines of what UPS or CAL has to come out of it. DAL mgt will push to have 3 bid/pay categories 76-4-3-2/757, 737 and MD88 (adios to the 777).
5. The current 757/767 drivers, a good portion would not be happy because you will have a lot of senior guys dropped on top of the position seniority list, and it would also mean the possibility of having more international long-haul flying.
This doesn't make sence because along with the influx of sr 767-400 pilots comes the 767-400 aircraft that they are currently flying. If anything the 767-400 pilots may stand to get a better Q of life because they will be able to bid any line vs the limited number of 764 lines.
Later