Originally Posted by UAPremExecflyer

This is a really straightforward and easy connection.
Assuming you are on one PNR, your bags should go straight through to CDG.
Make sure you fill out the immigration card - even though you are only in transit - before getting off the plane from DCA.
At YYZ, follow the signs for connections. It's a good 5-6 min walk from your gate. Then you make a sharp left at the International transit/connection desk - can't remember exactly what it's called - agent looks at your passport and you're on your way. Make a left again and walk down a really long moving walkway and you'll find yourself by the MLL and your departure gates.
http://www.aircanada.com/en/travelin...z_us_intl.html