CREATE TABLE 'airlines' (
	uid INTEGER PRIMARY KEY, 
	Airline TEXT, 
	Abbreviation TEXT, 
	Country TEXT
)

CREATE TABLE 'airports' (
	City TEXT, 
	AirportCode TEXT PRIMARY KEY, 
	AirportName TEXT, 
	Country TEXT, 
	CountryAbbrev TEXT
)

CREATE TABLE 'flights' (
	Airline INTEGER, 
	FlightNo INTEGER, 
	SourceAirport TEXT, 
	DestAirport TEXT, 
	PRIMARY KEY(Airline, FlightNo),
	FOREIGN KEY (SourceAirport) REFERENCES airports(AirportCode),
	FOREIGN KEY (DestAirport) REFERENCES airports(AirportCode)
)
SELECT AirportName FROM Airports WHERE AirportCode NOT IN (SELECT SourceAirport FROM Flights UNION SELECT DestAirport FROM Flights)
Find the name of airports which do not have any flight in and out.