Database: aircraft
Question: What are the names and descriptions of aircrafts associated with an airport that has more transit passengers than 50000?
SQL: select t1.aircraft ,  t1.description from aircraft as t1 join airport_aircraft as t2 on t1.aircraft_id  =  t2.aircraft_id join airport as t3 on t2.airport_id  =  t3.airport_id where t3.transit_passengers  >  50000