Birdstrikes caused 400,000 of aircraft down time$216 million in direct costs$4.22 billion of indirect costs. The FAA estimates that bird strikes cost civil aviation over $500 million per year in the USA. FAR 139 WILDLIFE MANAGEMENT. FAR 139 WILDLIFE MANAGEMENT. Airport Operators must establish instructions and procedures for the prevention or removal of factors on the airport that attract, or might attract wildlife.