That's perfect - many thanks for bringing the Air mail Leaflets to my attention, I hadn't seen them before. Now I understand how complicated early Air Mail rates can be and why there is not a simple way to access a summary!
Your work in this area is much appreciated.
Dave Russum

I have a cover sent from London to Vancouver in 1929 with 8.5d postage and an Air Mail sticker. I know that there was no Trans-Atlantic Air mail at the time so this applies to the Canadian portion of the trip. I have seen another cover sent in 1930 from Southend-on-Sea to Clinton, Ontario with an Ai...