What is the number of different different airports that are destinations for American Airlines?
SELECT count(DISTINCT dst_apid) FROM airlines AS T1 JOIN routes AS T2 ON T1.alid  =  T2.alid WHERE T1.name  =  'American Airlines'
SELECT count(DISTINCT dst_apid) FROM airlines AS T1 JOIN routes AS T2 ON T1.alid  =  T2.alid WHERE T1.name  =  'American Airlines'
[{'count(DISTINCT dst_apid)': 431}]