SELECT T1.Airline FROM AIRLINES AS T1 JOIN FLIGHTS AS T2 ON T1.uid  =  T2.Airline GROUP BY T1.Airline ORDER BY count(*) DESC LIMIT 1
What airline serves the most flights?
SELECT T1.Airline FROM AIRLINES AS T1 JOIN FLIGHTS AS T2 ON T1.uid = T2.Airline GROUP BY T1.Airline ORDER BY count ( * ) DESC LIMIT 1
select t1 . airline from airlines as t1 join flights as t2 on t1 . uid = t2 . airline group by t1 . airline order by count ( * ) desc limit value
What airline serves the most flights ?