The problem becomes two fold.
First off career expectations do differ. NWA has 36 -747's with a pay rate of $232
They also have 15 A330's and 22-DC10's @$209. DAL has 8 -777 @ $216 21-767-400' @$204. The NWA guys will want a proportional rate of future wide body flying and fences on 747's. This is hwat they already have with the red, blue and green lists.
Secondly NWA has the most in efficient seniority list in the business and this really places a hamper on trying to increase any future intergrations. When I was there they actually had 6 divisions, per aircraft, per base, per seat. Example MEM DC9 Capt had Red, Blue and Green guys and then they had line guys and reserve guys with no intergration. They are also the only airline that still has 2 international captians on long haul flying, everyone else has gone to 1 capt. By the time they get done with their list and DAL's Green and yellow slips this will be the list of the century. Until then it would really be a scheduling nightmare. Then once the list is done it becomes a training nightmare. Before any efficiencies are ever achieved. You could eaisly be a capt on your JFK-Kiev route