While hardly a scientific study it seems that AE is charging higher fees for tickets booked under ClassicFlight vs. ClassicPlus.

Does it cost AE more to charge me less miles? Or maybe there is a ClassicFlight system access fee that they are charging?

YUL-YYZ
ClassicFlight
Airport taxes, charges and fees - adults $94.51
ClassicPlus Flight
Airport taxes, charges and fees - adults $48.93

YUL-YVR
ClassicFlight
Airport taxes, charges and fees - adults $89.21
ClassicPlus Flight
Airport taxes, charges and fees - adults $43.63

YUL-EWR
ClassicFlight
Airport taxes, charges and fees - adults $125.61
ClassicPlus Flight
Airport taxes, charges and fees - adults $83.21