เครื่องบินลำเล็กที่สุดที่บินจากพิตต์สเบิร์กไปบัลติมอร์ในวันที่ 8 โมงเช้าคือเครื่องบินลำใด 16ไม่จำเป็นต้องใช้ตารางทั้งหมด
what 's the smallest plane that flies from PITTSBURGH to BALTIMORE on eight 16It is not neccessary to use all the tables.
 airline:  airline_code [ varchar]  airline_name [ text]  note [ text] 
SELECT DISTINCT aircraft.aircraft_code FROM aircraft, airport_service AS AIRPORT_SERVICE_0, airport_service AS AIRPORT_SERVICE_1, city AS CITY_0, city AS CITY_1, date_day, days, equipment_sequence, flight WHERE (CITY_1.city_code = AIRPORT_SERVICE_1.city_code AND CITY_1.city_name = 'BALTIMORE' AND date_day.day_number = 16 AND date_day.month_number = 8 AND date_day.year = 1991 AND days.day_name = date_day.day_name AND flight.flight_days = days.days_code AND flight.to_airport = AIRPORT_SERVICE_1.airport_code) AND aircraft.capacity = (SELECT MIN(AIRCRAFTalias1.capacity) FROM aircraft AS AIRCRAFTalias1, airport_service AS AIRPORT_SERVICEalias2, airport_service AS AIRPORT_SERVICEalias3, city AS CITYalias2, city AS CITYalias3, date_day AS DATE_DAYalias1, days AS DAYSalias1, equipment_sequence AS EQUIPMENT_SEQUENCEalias1, flight AS FLIGHTalias1 WHERE (CITYalias3.city_code = AIRPORT_SERVICEalias3.city_code AND CITYalias3.city_name = 'BALTIMORE' AND DATE_DAYalias1.day_number = 16 AND DATE_DAYalias1.month_number = 8 AND DATE_DAYalias1.year = 1991 AND DAYSalias1.day_name = DATE_DAYalias1.day_name AND FLIGHTalias1.flight_days = DAYSalias1.days_code AND FLIGHTalias1.to_airport = AIRPORT_SERVICEalias3.airport_code) AND CITYalias2.city_code = AIRPORT_SERVICEalias2.city_code AND CITYalias2.city_name = 'PITTSBURGH' AND EQUIPMENT_SEQUENCEalias1.aircraft_code = AIRCRAFTalias1.aircraft_code AND FLIGHTalias1.aircraft_code_sequence = EQUIPMENT_SEQUENCEalias1.aircraft_code_sequence AND FLIGHTalias1.from_airport = AIRPORT_SERVICEalias2.airport_code) AND CITY_0.city_code = AIRPORT_SERVICE_0.city_code AND CITY_0.city_name = 'PITTSBURGH' AND equipment_sequence.aircraft_code = aircraft.aircraft_code AND flight.aircraft_code_sequence = equipment_sequence.aircraft_code_sequence AND flight.from_airport = AIRPORT_SERVICE_0.airport_code