I have a problem with certain airports showing up during flight tracking, yet when I try to track flights for that airport designator, FlightAware reports that the airport code is invlaid. Why is this? I even used the airport code lookup feature and the airport is in the list. This isn’t the smallest airport in the state by any means btw. There are grass strips that come up with the ONE flight they have scheduled that day?! Yet my relatively busy local GA airport does not. Can someone shed some light on why this is happening?