If you aren't actually flying much AC to make use of upgrades and concierge access, you should consider crediting your *A flying to United. Their program is very generous for non US residents (no $ spend requirements, minimum 4 segments per year on UA metal to get status), and the redeemable miles are a lot more secure than AC right now due to the impending end of the Aeroplan / AC partnership. Redeemable miles earned today on AC may not be usable on anywhere near the same terms after 2019.