Originally Posted by IluvSQ

1) you cannot redeem AE miles for F Class on ( long-haul) SQ, nor for any class on Emirates.
2) Most airlines do not offer F class on short/regional flights, so any F reward almost has to include some J travel.

This week I redeemed the following reward. You have to decide if you consider it worthwhile or not:

YYZ- ( AC J) - LGA // JFK - ( OZ F) - ICN - ( OZ J) -PVG - ( SQ J) - SIN - (SQ F) - CGK - ( SQ F) - SIN - (SQ J) - ICN - (OZ F) - JFK - ( AC J) - YUL - (AC J) - YYZ
( Stops in Shanghai, Jakarta, and Seoul on the return - the others are connections)

So the 2 longhaul flights across the Pacific are in F, 2 shorthauls on SQ are in F, and everything else is in J.
The week before I come home, if LH F is available I may change the return from ICN to ICN-FRA-ORD/BOS - YYZ.