SELECT T1.City FROM AIRPORTS AS T1 JOIN FLIGHTS AS T2 ON T1.AirportCode  =  T2.SourceAirport GROUP BY T1.City ORDER BY count(*) DESC LIMIT 1
Which city is the most frequent source airport?
SELECT T1.City FROM AIRPORTS AS T1 JOIN FLIGHTS AS T2 ON T1.AirportCode = T2.SourceAirport GROUP BY T1.City ORDER BY count ( * ) DESC LIMIT 1
select t1 . city from airports as t1 join flights as t2 on t1 . airportcode = t2 . sourceairport group by t1 . city order by count ( * ) desc limit value
Which city is the most frequent source airport ?