Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE Flights (AirportName VARCHAR, AirportCode VARCHAR, SourceAirport VARCHAR, DestAirport VARCHAR); CREATE TABLE Airports (AirportName VARCHAR, AirportCode VARCHAR, SourceAirport VARCHAR, DestAirport VARCHAR)
### Question:
Find the name of airports which do not have any flight in and out.
### Answer:
SELECT AirportName FROM Airports WHERE NOT AirportCode IN (SELECT SourceAirport FROM Flights UNION SELECT DestAirport FROM Flights)