My two cents.
My old man flew for FDX for about 15 yrs. He had 24 yrs AD. Between the two, he pulls in about 90K/yr retirement. Pretty nice deal if you ask me.
I had a Capt (still military, ALO for USAFA) tell me the other night that if I bagged an extra trip or two on draft or something like that each month, I'd come out way ahead in the long term on that pay vs mil retirement. He's right, but I still really, really enjoy flying fighters. I guess the bottom line is that I'll fly for as long as I enjoy it and still feel safe in a fighter. After that, I'll do the non-fly/ALO gig for USAFA. The 20 yr gig is very attractive, and I guess my advice is to serve as long as you feel comfy. If you're young and sandbag extra trips, you'll come out ahead. However, if (god forbid), FDX has the "troubles," and isn't around in 20 yrs, then f*** yeah the Mil retirement looks good!