On my recent flight to and from Vancouver, I learned about this offer for earning Air Canada Aeroplan miles. Even though the mileage earning potential is small, I will tell you about it anyway.
When you are flying, you can earn Aeroplan miles with your onboard purchase. You can earn 25 Aeroplan Miles when you spend $10 to $19.99 (exclusive of taxes) and 50 Aeroplan Miles when you spend $20 or more (exclusive of taxes).