Originally Posted by fastair

Yes, there are. "Stitching" a group of local inventories is not the same as a origin-destination inventory being available. Unless you want to pay individualy for each flight, instead of getting a singly priced fare from A to B thru as many C,D,E,F of your choosing, your method most likely is not necessarily going to return the ticket you want. Carrier A may want to sell a local Q fare from A to B and also a local Q fare from B to C. That doesn't mean that they want to sell a Q fare from A to C via B, as they can may be able to make more $$ selling the separate tickets. If you want from A to C, that fare must be available when requesting space from A to C, not from A to B and a separate request from B to C.