The Airport Departures and Arrivals feature is available to paid subscribers. Please select Departures and Arrivals from the Airports menu. Type in the airport code if you know it. If not, type in the city name and select the airport code from the drop-down box. Select the date and then hit Search Departures or Search Arrivals.
The application will display a subset of the flights for the airport on that day. You can use the advanced filters of the tool to narrow down the results to just the flights you are interested in. If you see a flight you want to track, click on the flight record for detailed status information.