11 Eylül, havacılığı sonsuza dek nasıl değiştirdi: havaalanı güvenlik kontrol noktalarından kokpit kapısına

Twenty-five years after the attacks of 11 September 2001, their effects are still visible on almost every commercial flight. Passengers pass through controlled security checkpoints, baggage is screened, crews follow strict flight-deck access procedures, and airlines work with governments to identify...