In my opinion, the numbers you are trying to calculate are unknown. The last number I heard for furloughs that responded they will return is 143. There is a near zero percent chance that 143 actually return since there are few if any consequences of saying you will return then resigning later. A pilot furlough scheduled for a November 4 class could resign on October 21 and still give two weeks notice. Some might just not show up for class. You can see how that would change hiring numbers.

I have read that the plan is 50 pilots per month November through January and 20 per month after that on an as needed basis. Compass has a hold back provision that could leave space in early classes. I don't know if Mesaba has a hold back provision and I don't know if Delta plans on bringing back furloughs all at once or metered throughout the process. There are a lot of possibilities; use your imagination. I choose to believe that zero furloughs will return, Delta will only run classes of 20, and Compass won't hold back. Of course, I'm at Compass so I might be biased.