instruction: show me all the flights out of BOSTON today
response: SELECT DISTINCT flight.flight_id FROM airport_service, city, date_day, days, flight WHERE city.city_code = airport_service.city_code AND city.city_name = 'BOSTON' AND date_day.day_number = 13 AND date_day.month_number = 6 AND date_day.year = 1991 AND days.day_name = date_day.day_name AND flight.flight_days = days.days_code AND flight.from_airport = airport_service.airport_code