For any planespotter, the park at the end of Mertyl Avenue is the place to go. Directly under the landing flightpath at Heathrow Airport, spotters can find themselves up close with giant airliners coming into London.
Check the link to see when runway 27L is in use but note that things could change depending on wind direction.
Nearest stations:
UG: Hatton Cross 0.46km
OG&UG: Heathrow Terminal 4 1.4km
OG: Heathrow Central 2.15km
Always check details regarding opening hours, accessibility and pricing before travelling.