import json

data = None
extractedData = []

with open("airport-codes_json.json", "r") as read_file:
    data = json.load(read_file)
    
for item in data:
    if item.iata_code != None:
        extractedData.append(item)

with open("iata_only.json", "w") as write_file:
    json.dump(data, write_file)