Originally Posted by hydrogen

Probably asked this before, but does anyone know how Matrix handles married segments?
Looking to book an AC/CA itinerary on AC ticket stock but Matrix constantly shows a cheaper fare than can be found via AC/OTAs
Matrix shows P class availability but can only access Z via AC/OTAs. Even Expertflyer doesn't really show P class availability on the O-D search or the TPAC segment (but does if I search AC Canada-Asia segment without including CA segment).
Is this an issue with Matrix's handling of married segments, failure to search inventory in real-time, or something else?
Would love to ticket at P class but having difficult doing so via AC/OTA (even BookWithMatrix doesn't work). Any thoughts?