We just released a new class 2 function, countAirportOperations.
You call it with one argument, an airport code. It returns counts of the number of aircraft coming to/from the airport. See the documentation for more details.
This incorporates a WSDL change that doesn’t break backwards compatibility. However, if you cache the WSDL or generate a stub file from the WSDL, you’ll need to download & re-generate to use the new function.