Married segments availability for AA-marketed / BA-operated flights Hi FT- sorry it’s a bit of a technical question here but I struggle to find any info on this in our forum.

I am aware that AA offer “married segment” availability, for example you may have 0 availability in I class on a LHR>JFK flight, 0 as well...
https://www.flyertalk.com/foru....m/british-airways-ex