how many on the airport table
select count ( * ) from airports
what is the country of goroka
select country from airports where city = 'Goroka'
find the name and city of the airport which is the destination of the most number of route.
select t1.name, t1.city from airports as t1 join routes as t2 on t1.apid = t2.dst_apid group by t2.dst_apid order by count ( * ) desc limit 1