So if you select Copenhagen, say, you'll see all the flights departing Copenhagen (with passenger and flight counts, seat counts and load factors). If you select JFK, say, you'll see all arrivals at JFK from European airports.
Unfortunately, this data set does not include Turkey as a departure point, so for Turkish airports you can only see arrivals from EU28/EFTA airports.
(I plan to make the same simplification for cargo too, in future.)