My point was unintended consequence of complaining was the arrival of a wonderful map of all the flights from one day plotted across the city - like one of the pages from 'The information capital' book (which I heartily recommend to all who are not familiar with it).
If only the quality of the plot they sent had been up to it I would have had it as a print on the wall.
I felt better for complaining but had no expectation it would elicit any change.