What is the id, name and IATA code of the airport that had most number of flights?
create table airport (id varchar, name varchar, iata varchar, PRIMARY KEY (id)); create table flight (id varchar, airport_id varchar, PRIMARY KEY (id))
select t1.id, t1.name, t1.iata from airport as t1 join flight as t2 on t1.id = t2.airport_id group by t2.id order by count(*) desc limit 1