From Airline Route Updates, American and WestJet have further expanded the routes they code share on:
American Airlines operated by WestJet
Calgary – Edmonton
Calgary – Phoenix
Calgary – San Diego
Edmonton – Phoenix (eff 01OCT11)
WestJet operated by American Airlines
Los Angeles – Fresno
Miami – Jacksonville FL
Miami – Key West
Miami – Nashville
Miami – New Orleans
Miami – Pensacola
Toronto – Boston