text: use airport;
  SELECT *
  FROM flight
  WHERE airport_in = airport_out
    AND date_out >= NOW() - 30;
  
  SELECT *
  FROM planes
  WHERE business_class > 0
    AND (model = 'Boeing 737' OR model = 'Boeing 747');
  
  SELECT *
  FROM planes
  WHERE first_class IS NOT NULL
    AND business_class IS NOT NULL
    AND model LIKE 'Airbus%';
  
  SELECT *
  FROM tickets
  WHERE class_type IN ('First class', 'Business class')
    AND passenger_id IS NULL;
  
  SELECT *
  FROM flight
  WHERE MONTH(date_out) = 3
    AND YEAR(date_out) = YEAR(NOW())
    AND airport_out = 'SVO'
  ORDER BY date_out;
  
  SELECT *
  FROM flight
  WHERE date_out BETWEEN '2018-03-01' AND '2018-03-31'
    AND airport_out = 'SVO'
  ORDER BY date_out;
  
  SELECT *
  FROM passengers
  WHERE doc_type = 'Паспорт'
    AND born >= NOW() - 14 * 365;
  