Originally Posted by
tth6133
With AC, you have the option to pay some extra miles upfront for an award that you can then cancel at any time, just like UA. Those extra miles you paid upfront are also refunded when you cancel. If you don't cancel, you'd still be paying fewer miles than you would with UA, even with those extra miles.
I'm no expert on Aeroplan, but from what I've seen the extra cost for a Latitude award kills any points savings compared to UA. AC also charges much higher fees than UA. Finally, UA is now severely limiting its award releases to partners, such that AC is likely not going to be a viable option for booking UA flights.
Is AC a viable option for booking *A awards? Yes, absolutely, but there are significant drawbacks, particularly for those who desire flexibility in their bookings.