Table schema:
CREATE TABLE airport (Airport_ID VARCHAR, Airport_Name VARCHAR); CREATE TABLE aircraft (Aircraft VARCHAR, Aircraft_ID VARCHAR); CREATE TABLE airport_aircraft (Aircraft_ID VARCHAR, Airport_ID VARCHAR)

Question: Show the names of aircrafts that are associated with both an airport named "London Heathrow" and an airport named "London Gatwick"
SQL: SELECT T1.Aircraft 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.Airport_Name = "London Heathrow" INTERSECT SELECT T1.Aircraft 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.Airport_Name = "London Gatwick"