That and there are/were only 195 MD-11 made that are still flying. With the A-380 and now the 787 being late, I'm sure the residual airframe value plus the cost of conversion added to its MX reliability and fuel usage, I would be disappointed in UPS if they weren't looking into other options. While the 777 would be the obvious choice of MD replacement/supplement, with the afore mentioned of the A-380 and 787 backlog, the residual 777 prices may be more than UPS can/will stomach. Not to mention the fact that if you want a new 777F, you may have awhile to wait since their PAX version is sold out for a little while. Just my 2 cents.