As one who worked and "grew up" with L.A.P, L.H.R. Heathrow 1947- 1994 and now long retired, in the early days there was a large variety of a/c types but not the volume of traffic ,now there is volume and not much variety due to the main fact that the world is dominated by 2 manufacterers Airbus and Boeing so things will only get worse as airlines rationalise their fleets ,as it is a lot cheaper in maintenance costs, spare parts ,and labour, engines [apart from the odd hiccup]seem to last forever with very little maintenance.
So for the aircraft type "Spotter " aircraft are going the same way as their train counterpart,they all look alike , these days I struggle to distingush twin engined Airbusses and Boeings when they are in the air I'm sure most of you can but they are alike in many ways but, I still get a buzz as I enter T5 for my holidays and see rows of airplanes arrive and depart.
