That's kinduva moot point, isn't it? Your disability would have had to start before 10/30/2006 AND you would have to have been over 60 at the time. That 5 years, at best case, would have ended in 2011.
Nowadays, the longest you can collect from the FedEx LTD is 24 months, but it stops when you hit 65 or retire (plus some other circumstances). The max amount is $13,000 a month (max of $260,000 base amount, times 60%, divided by 12).
After you run out of LTD, you go on Supplementary Disability. It pays a max of $10,833 a month (max of $260,000 base amount, times 50%, divided by 12). As long as you continue to be disabled, it runs till you hit 65 or retire (plus the other circumstances referred to above).
Once you go on Supplementary Disability, it might make sense to stay on it till age 65 even if you could retire before then on a full pension (50%). That way, your health care premiums are at active employee rates and not retiree rates. And there are probably other benefits to still being an employee rather than a retiree as well. On the other hand, most can begin receiving Social Security if they retire at age 62 and that may offset the increase in health care premiums.
Disclaimer: This is just my 2¢ worth. Your mileage may vary. Consult your own financial advisor.