NW pays 100% mileage for ALL "regular" paid tix - as far as I know! My question would be - - What does FB pay - - as AF cheaper tix only earn 25% when accruing to WorldPerks! Just a tidbit of information . . .

When I eMailed NW about this last year as I had bought 2 VERY cheap AF tix VERY early, I was told the reason for the newly discounted mileage accrual is because AF will not allow NW members to earn more mileage on AF flights than their own FB members earn for the same flights.

Also - NW Mileage Calculator shows 636 miles from NRT/ICN but Flying Fish shows 783. That's a pretty big difference! Usually they're within a few miles of each other.