Aero Linx: International Federation of Airworthiness (IFA) IFA uniquely combines together all those with responsibility for policies, principles and practices concerned with the continuing airworthiness of civil transport aircraft throughout the world. The International Federation of Airworthiness (IFA) is a Non-Governmental Organisation (NGO) dedicated to improving aviation safety by increasing international communication, awareness and cooperation on all airworthiness issues and particularly that of continuing airworthiness.