What are the names of airport which is the source for the most number of flight routes?
select t1.name from airports as t1 join routes as t2 on t1.apid = t2.src_apid group by t2.src_apid order by count ( * ) desc limit 1
Yes
select t1.city from airports as t1 join routes as t2 on t1.apid = t2.src_apid group by t2.src_apid order by count ( * ) desc limit 1