I am about to book a flight on AC from PEK to YVR (as part of a round-the-world trip LLA-ARN-CPH-PEK-YVR-PDX-ORD-DCA-ORD-ARN-LLA). AC seems to have 3 different versions of the B767-300ER (159y, 179y and 187y). Does anybody know which of these versions that is used on the PEK-YVR flights? As the seatmaps are quite different - I have trouble knowing which seat to ask for..
Many thanks in advance!