American Airlines (NYSE: AAL) and Porter Airlines launched a codeshare partnership that expands connectivity between the United States and Canada, which will deepen over time with broader global networks and loyalty integration. Starting today, customers will be able to book codeshare flights on both airlines’ platforms, greatly expanding the relationship between the two rapidly growing airlines. American Airlines AAdvantage members will be able to earn miles and loyalty points on American Airlines-marketed Porter flights, with future reciprocal earnings and redemption opportunities currently still in the works.