Only if you are flying on AC:

From April 1 to May 31, 2003, you'll earn Double Aeroplan Miles on direct, non-stop scheduled flights operated by Air Canada on the following routes:
between Montréal and Chicago, San Francisco (route starting May 1, 2003), or Los Angeles
between Toronto and Chicago, Dallas, Phoenix, Seattle, San Francisco, Los Angeles, or San Diego
between Ottawa, Winnipeg, Calgary, or Vancouver and Chicago
This offer is available in booking classes J, C, Y, M, B, H, V, and Q. Route start dates subject to change without notice.