Just got this a few days ago! Love it! Signed by the pilot and a big variety semi-official to boot.
The stamp is a CL46ii. The CL46ii incorporates CL46i ("Snow on Wings") which is caused by a colour shift. Also notice the shift in the maple leaves. Also incorporated is CL46a. CL46a involves a serif on the crossbar of "A" in "AIR".
See better details and more info in my blog on my site here:https://www.morelandrevenuestamps.com