Yes, 항공기 운항스케줄 is completely free and it doesn't have any in-app purchases or subscriptions.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
항공기 운항스케줄 is free.
To get estimated revenue of 항공기 운항스케줄 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.