CREATE TABLE operate_company (id DECIMAL, name TEXT, type TEXT, principal_activities TEXT, incorporated_in TEXT, group_equity_shareholding DECIMAL)
CREATE TABLE airport (id DECIMAL, city TEXT, country TEXT, iata TEXT, icao TEXT, name TEXT)
CREATE TABLE flight (id DECIMAL, vehicle_flight_number TEXT, date TEXT, pilot TEXT, velocity DECIMAL, altitude DECIMAL, airport_id DECIMAL, company_id DECIMAL)

What are the different pilot names who had piloted a flight in the country 'United States' or in the airport named 'Billund Airport'?
SELECT DISTINCT T2.pilot FROM airport AS T1 JOIN flight AS T2 ON T1.id = T2.airport_id WHERE T1.country = 'United States' OR T1.name = 'Billund Airport'
SELECT DISTINCT "T2"."pilot" FROM "airport" AS "T1" JOIN "flight" AS "T2" ON "T1"."id" = "T2"."airport_id" WHERE "T1"."country" = 'United States' OR "T1"."name" = 'Billund Airport'