Find the number of routes that have destination John F Kennedy International Airport.
SELECT count(*) FROM airports AS T1 JOIN routes AS T2 ON T1.apid  =  T2.dst_apid WHERE T1.name  =  'John F Kennedy International Airport'
SELECT count(*) FROM airports AS T1 JOIN routes AS T2 ON T1.apid  =  T2.dst_apid WHERE T1.name  =  'John F Kennedy International Airport'
[{'count(*)': 455}]