I think what the OP is highlighting is a pricing discrepancy on two-class AA services. Effectively, the Avios pricing 'ignores' the lack of J and charges F at 3x Y.
Recently, on BA.com, I was offered:
- LAX-EGE in Y for 7.5k Avios
- LAX-EGE in F for 22.5k Avios
- i.e. Three times the price on a two-class service
However, AA.com offers:
- LAX-EGE in Y for 12.5k miles (Economy MileSAAver)
- LAX-EGE in F for 25k miles (Busines/First MileSAAver)
- i.e. Two times the price on a two-class service
I doubt this is deliberate; probably more likely to be a system bug that can be fixed if the right person can be notified.
By the way - I booked Y - good value - and cheaper than the original BA Miles booking!