Airport Activity Graphs

Am looking at the airport activity graphs for JFK. Why does it seem that the number of departures does not equal the number of arrivals over the course of a day or longer time period? The number of departures is much higher.

Probably due to flights ending with cancellation messages instead of arrival messages.

Or Boeing just started a new aircraft factory at JFK. :slight_smile:

I see it with other airports too, where there seems to be a lot of international ops. Could it be related?

Yea, a lot of international flights never “start” so I don’t think we count their arrival on the graphs.