Let me give the true example. If the cheapest published fare on AC from YOW to YVR (one way) is (let us say) $450. Let us say that the one way fare from YOW to YYZ is $200, and the one way fare from YYZ to YVR is also $400. Let us say that Sabre does not give a particular YOW-YYZ-YVR flight combination automatically (as is often the case with aircanada.com) - let us say that one has to input the 2 segments manually. The aircanada.ca web site often adds up the fares (ie $200 + $400), rather than giving a combined fare of $450. Would either of the sabre access methods add the fare (eg $600) vs combining the fare (eg $450).

Let us now give the example for YOW-DEL. The cheapest return AC fare is $1150+ (in March). Let us say the return BOS-DEL fare on LX (a real example) next March is about $650. Let us say the return AC fare between YOW-BOS is $250. If I try to enter the segments manually, assuming those are combinable fares, would either of the Sabre access methods add the fares (ie $250 + $650), or give a combinable fare closer to $650, or give a combinable fare closer to $1150 (the return fare if one flies on AC - metal or codeshare - all the way).