The FBI maintains jurisdiction over investigating crimes on U.S. aircraft, airspace, or assaults involving American citizens. There were 101 allegations of sexual assault on cruise ships embarking and disembarking in the United States in 2019, and there were 82 the year before, according to cruise-line incident reports from the Department of Transportation. The FBI reported that inflight sexual assaults increased by 30% from 2018 to 2019. The bureau determined sexual predators typically attack on long-haul flights when the cabin is dark, perhaps because of fellow passengers taking sleeping pills or consuming alcohol. Perpetrators target those covered with a blanket in the middle or window seats.