text: insert into route(id, flight_number, departure, destination) values(101, 'LH7902','MUC','IAH');
  insert into route(id, flight_number, departure, destination) values(102, 'LH1602','MUC','IBZ');
  insert into route(id, flight_number, departure, destination) values(103, 'LH401','FRA','NYC');