An onboard incident involving an alleged sexual harassment has drawn attention to in-flight harassment and how airlines are trained to respond. Toronto Star journalist Joanna Chiu posted on Twitter about a recent flight in which she overheard a man who appeared to be in his late 30s ask a teenage girl for a "dirty" photo. Chiu said she and other travellers intervened, informing the flight crew who had the man move after some resistance. The post prompted hundreds of responses highlighting the harassment and aggression women often endure while travelling. The post also highlighted how bystanders and flight crew can play a critical role in helping victims. In response, Canada's two biggest airlines say its crews are trained to handle passengers who pose a threat. Crews have the authority to remove a guest from the flight at the next touchdown and request authorities on the ground ahead of time. On board is a restraining kit that includes handcuffs, an upper-body seat belt and even a spitting mask. Air Canada declined to detail its training procedures but said it has a range of protocols to handle safety concerns. One expert however warns that airline policy and behaviour are two different matters.