public override IEnumerable <Row> Execute(IEnumerable <Row> rows)
        {
            using (var conn = new NpgsqlConnection(conString))
            {
                conn.Open();
                foreach (var row in rows)
                {
                    AirportRepository.Add(conn, (string)row["OriginAirportName"], (string)row["OriginCityName"], (string)row["OriginState"], _dictAirport, _dictCity, _dictState);
                    AirportRepository.Add(conn, (string)row["DestAirportName"], (string)row["DestCityName"], (string)row["DestState"], _dictAirport, _dictCity, _dictState);

                    yield return(row);
                }
            }
        }