How many flights on 2018/8/1 were operated by American Airlines Inc.?
on 2018/8/1 refers to FL_DATE = '2018/8/1'; American Airlines Inc. refers to Description = 'American Airlines Inc.: AA';
SELECT COUNT(*) FROM Airports AS T1 INNER JOIN Airlines AS T2 ON T1.Code = T2.ORIGIN INNER JOIN `Air Carriers` AS T3 ON T2.OP_CARRIER_AIRLINE_ID = T3.Code WHERE T2.FL_DATE = '2018/8/1' AND T3.Description = 'American Airlines Inc.: AA'