DONEx - US flights
 

When booking a flight within North America on a DONEx you get booked into A (where D does not exist).
QF has codeshares on many of those flights, which (according to the booking tool) book into D.

If booked in D on one of those 2 class AA/US flights, do you still sit in the F cabin?

Yes, for those FLTs it does not matter whether you are booked in F (A) or J (D), you will sit in the First cabin. Miles earned is based on booking class, though, so you will have to think about whether it is better to book on AA-A or QF*/AA-D.

Well, the upcoming changes to the QFF program changes status credit earn on partner airlines with flights under a partner code earning up to 50% fewer credits then the same sector under a QF code.

In some cases, it might mean more credits in D on a QF code then in A on the AA code.

I see. I noticed the recent QFF change but did not look that much into it. Thanks for letting me (us) know.

QF changes will impact AA flights under 750 miles.

Relevant tables (ignoring classes not applicable) for AA coded

Intra-USA shorthaul - under 750miles
Disc Y - 10 SC
Y - 20 SC
J - 30 SC
F - 40 SC
For QF table - identical but with min point guarantee

Then Other - 750-1500miles
Disc Y - 15 SC
Y - 30 SC
J - 60 SC
F - 90 SC

Other - 1500-2500miles
Disc Y - 20 SC
Y - 40 SC
J - 80 SC
F - 120 SC

For the non QF partners in OW:

Given AA's hub in DFW, it was relatively easy to arrange flights just over 1200 miles (the old mileage "boundary"). So in effect (in the F cabin) northeast USA (DFW) LAX has gone from 240 QF SC to 180.

Still a price effective way to earn SC. Just not as useful as previously. SE Asia still has a few just over 1500 mile routes.

Happy wandering

Fred