How many airports had Thompson driven by August 1963?
SELECT count ( * )  FROM airport as T1 JOIN flight as T2 on T1.id  =  T2.airport_id WHERE T2.pilot   =   'Thompson' and T2.date > 'August 16, 1963'
count of airports = COUNT(*); driven by Thompson refers to T2.pilot = 'Thompson'; by August 1963 refers to T2.date > 'August 16, 1963';