SWA guy here. The numbers are as follows:
VSP: 529 (plus another 158 in the 7-day opt out window) (461 CA/68 FO)
ExTO: 1559 (481 CA/1078 FO)
VSP - 5 year paid permanent leave. No longer an employee but still retain some benefits (limited healthcare, non-rev, etc.) Paid 67 TFP/mo (~60 hours to you DAL guys)
ExTO - Temporary leave of 6 months to 5 years. Still on seniority list, get annual pay raises, normal benefits, etc. Paid 55 TFP/mo (~50 hours)