Originally Posted by
dr_torch
If you have mixed segments on non-014 ticket stock the formula is this:
(# miles on AC segments / # of total miles flown) * ticket cost.
Example: $1000 ticket SFO-ORD-YYZ (where ORD-YYZ is on AC)
436 miles (ORD - YYZ) / 2,282 miles (SFO-ORD-YYZ) = 0.19 * $1000 = $190.00 AQD
Please feel free to correct me if I am wrong - but that is how I understand the system

I'm not sure if that's the case. Based on my conversations with AC and UA today, it sounds like each segment has its own base fare associated, and they didn't appear to be simple pro rata allocations of the total base fare based on miles.