Originally Posted by
treadigraph
Heathrow seems quite busy today - just my imagination or is there a bit more activity?
It's neither of those.
Many people will be seeing more (or fewer) aircraft today, not because there has been any change in the number of movements but because, after 10 days of operation on easterlies (using 09L or 09R), the wind changed direction this morning and brought 27s into use (currently 27R, from tomorrow 27L).
So how many aircraft you're seeing is largely a function of where you live.