Originally Posted by bowman
Obviously I need to drop MAD then and go CAI-LHR directly. Then I have 4 segments in Europe.
As Viajero pointed out, this would render LHR-DXB-LHR ineligible, as you're allowed only two flights between the UK and the Middle East. You could however drop the DXB-LHR flight, and do DXB-HKG. This still leaves the problem of your final segment LHR-CAI. You could do MIA-MAD-CAI instead, and both IB and AA offer F on MIA-MAD.
If you do that, you'll have a spare segment. Since you only have threesegments in Asia, you could add another one there.
Originally Posted by bowman
Another question. I have the choice between BA, QA and CX on LHR-HKG, which is best in F?
Opinions seem to differ on this. You can find comparisons of BA versus CX F-class in the Trip Reports forum.