Among the flights on 2018/8/1, how many of them were scheduled to depart from John F. Kennedy International in New York?
on 2018/8/1 refers to FL_DATE = '2018/8/1'; depart from refers to ORIGIN; John F. Kennedy International in New York refers to Description = 'New York, NY: John F. Kennedy International';
SELECT COUNT(T1.Code) FROM Airports AS T1 INNER JOIN Airlines AS T2 ON T1.Code = T2.ORIGIN WHERE T2.FL_DATE = '2018/8/1' AND T1.Description = 'New York, NY: John F. Kennedy International'