$connection->prepare_query($sql_pquery);
$connection->prepared_query_bind_param("iss", array($client_id, $flight_id, $class_name));
$connection->run_prepared_query();
$connection->prepare_query($sql_pquery);
$connection->prepared_query_bind_param("iss", array($client_id, $flight_id, $class_name));
$connection->run_prepared_query();