Thank you for the heads up, I've found the issue were I was using and old airport database from 2017 (source of error / missing airport code), now turned it int

Thank you for the heads up, I've found the issue were I was using and old airport database from 2017 (source of error / missing airport code), now turned it into a self healing one using the API. So, error should be gone. Actually, flight codes with IATA should've also worked but API returns no results for now, I will have to ask them asap. Best