Pick the right earning card
Compare Aeroplan and other airline cards at /ca/credit-cards/airline using the figures on each card's page. If you hold American Express Membership Rewards points, check the current conversion terms before transferring, because a transfer can't be reversed.
Price the trip in points and in cash
Search the flight reward on aircanada.com and note the points plus the taxes and fees. Divide the cash fare you would otherwise pay by the points required, and compare that with other ways to use the same points.
Use the booking features
On an international trip, consider a stopover: one per direction, for 5,000 points, in a city outside Canada and the U.S. On partner airlines, allow for the per-ticket Partner Booking Fee.
Keep your account active
Earn or redeem at least one point in every 18-month period unless you hold a qualifying Aeroplan credit card or Elite Status. Your points inactivity date is shown under the Activity tab in your Aeroplan account.