Originally Posted by
guv1976
Wirelessly posted (BlackBerry: BlackBerry8530/5.0.0.1030 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)
You ask for the voluntary downgrade because of -- not despite -- the lack of F availability on one segment. (If there were F availability on that segment, why on earth would you choose to sit in J?)
If, on the other hand, the flight in question simply does not have an F cabin, then it's not really a voluntary downgrade; it's simply an F award where one of the segments only has J and Y cabins.
In any event, if you fly even one segment in a three-class F cabin, the entire award should price as F, regardless of where you sit on the remaining flight(s).