My pet hate is the ‘Americanisation’ of the English language and they call even a grass airfield an ‘Airport’. Just look at Google Maps!
In the Australian context I believe an Airport is one with an RPT service/s.
Aerodrome and Airfield are appropriate for other ‘landing grounds’ in my view.
As for. ‘Airplanes’ what ever happened to ‘aeroplane’...? Even Oz media seem to copy the yanks!! Geeez!