I can't even pull up any results with MS 778. The best I have is:
Code:
AC 850 YYC-LHR 20:10 - 11:50+1 789 J9 C9 D9 Z8 P0 R0 O2 E0 A0 N0 Y9 B9 M9 U9 H9 Q9 V9 W9 S9 T9 L9 K0
AC 2850 LHR-CAI (MS) 15:00+1 - 21:55 77W J4 C4 D4 Z0 P0 Y4 B4 M4 U4 H4 Q4 V4 W4 S4 T4 L4 K0
Have you tried booking the codeshare? I'd even force it into O and Q.