That's the hard part because you have to look at what is the daily/weekly utilization of that a/c. If it does nothing but one turn/day to the Caribbean then you need 7-8 f/as/dayx7, and if they are on a 2on-2off line (unlikely in International, I think) then you need 3 "sets" of f/as.
I agree however that I don't think anyone should count too highly on Overage Leaves or attrition eliminating the overage. Let's assume for a minute that Rock Solomon has good solid information--that the estimated overage is, in fact, 3000 f/as. With an average attrition rate of 60/month--and that's everything...quits, dies, retires, get fired--by the end of the year less than 1/4 of the overage would be mitigated by attrition. Does anyone really believe that they are going to get 2200-2300 overage leave takers? We didn't in 2003 when we had a much larger "active" f/a corps than we have today (approx. 25,000 then vs. 18,000 now). That's why over 3000 of us were furloughed then.
I've already cancelled plans for a new kitchen floor this summer until I know the company's numbers which will be late June-mid July.