The answer to your questions is exclusively within the terms of the NW
pilots' labor contract. I don't know the details of that contract, but in generally accepted major USA airline/pilot contract terms the basics would be...
Obviously, the FE is losing his spot on these planes since the new ones are 2 person cockpits.
There will be a net reduction in total cockpit crew positions at NW IF
there is a one-for-one replacement of equipment. I think UA
was the last major airline with professional (non-pilot) Flight Engineer positions so the NW
's would bid
for any job openings within the NW
system that their seniority could hold. Any excess pilot(s) would be furloughed, again based upon company-wide system seniority.
But is NWA retraining the Diesel10 pilots for the 'bus, or are they promoting up pilots from the a320?
Probably a mixture of both as the positions will be filled by those who bid
for the opening based upon seniority and the specific details (rights and limitations) provided for in the NW
I know that it takes a day or two to train an existing airbus fbw pilot for one of the other types (one of the most hyped features of the buses),
Maybe yes, maybe no... depends upon what the FAA has certified NW
's training program to perform.
...but how long would it take to retrain a pilot from the DC-10 to fly these new birds?
Generally one can figure aprox. 4 weeks: 2 weeks of ground school and 2 weeks of simulators.