I’ve created a table with the current active American Airlines mainline fleet, which consists of 945 aircraft. You can see how many seats are in each aircraft type, and how many of each type they have in service. The table is accurate as of today.
American’s mainline fleet currently consists of 330 first class seats; 16,562 business class or domestic first seats; 2283 premium economy seats; and 146,063 coach seats.