120 would surprise me. The senior Delta guys have no retirement tied to the company. Crazy to take a early out when the disability option is a much better financially. Simply go in and tell the truth on your next medical.
The senior NW guys are making a great dollars in GS's and wont be leaving unless that dries up like the 2009 when we had a major surplus of pilots. My guess is around 50 and all of them will be pilots who planned on leaving in the next year anyway so they have no real effect on advancement.