在一个平凡的夜晚,美丽的空中小姐珍妮(Mercedes Masöhn 饰)和朋友宝拉(Bre Blair 饰)登上天空航空公司飞往堪萨斯的318次航班,执行有一次看似平常的飞行任务。一如既往,这架小型飞机上聚集着各色各样的乘客,珍妮耐心友善地服务乘客,却不知危险正渐渐逼近。飞行途中,一名肥胖的乘客神态异常,在吐了珍妮一身秽物之后,竟发狂地冲向驾驶舱要求下飞机。机舱内一片混乱,万般无奈之下,飞机只得迫降于洛杉矶机场。而在这一过程中,宝拉也被胖子啃噬,情况危急。 机组成员和乘客来到洛杉矶机场,却发现偌大的机场内空无一人,他们仿佛被世人囚禁于一个隔离的区域中……In Los Angeles, the police put a residential building in quarantine. Meanwhile, the flight attendants of Trans Sky Air, Jenny and Paula, are welcoming the passengers of flight TS Air 318 from Los Angeles to Kansas City with Captain Forrest and Co-Pilot Wilsy. Teacher Henry brings a cage of hamsters to the cabin, but Jenny tells him that it should be transported in the cargo hold. However, one hamster bites the fingertip of the fat passenger Ralph. Soon, Ralph vomits and becomes aggressive, attacking Paula. The male passengers help Jenny and lock Ralph in the bathroom while Captain Forrest requests an emergency landing. When they land in the airport, they find all the gates closed and the Captain heads the plane to an abandoned terminal. Employee Ed helps the crew and passengers to reach the exit, but they find that they are closed. Soon they discover that the place is in quarantine and there is no way out.