Great question - CDG to CNS just means Paris Charles de Gaulle Airport to Cairns Airport. Now you’ll know what these unique codes when you look for flights! Lyon-Saint Exupéry Airport (LYS), Marseille Airport (MRS), Paris Orly Airport (ORY), Nantes Atlantique Airport (NTE), Nice Côte d'Azur Airport (NCE) are some additional IATA codes for airports related to your trip.