Originally Posted by HeathrowGuy

For reasons only its developers can explain well, the SHARES system is arguably the most difficult of the major airline IT systems to adapt to multi-carrier functionality (i.e., StarNet). SHARES has particular trouble in displaying OAL inventory when connecting flights are involved.

Thankfully, CO has had a MUCH smoother ride in integrating SHARES into StarNet than another Star member which basically offered minimal Star award options for months on account of a botched SHARES transition.