: Realizing they have nowhere to land and are running out of fuel, the passengers and pilots initially decide to let the plane crash into the sea to prevent the virus from spreading.
: On the ground, Detective In-ho courageously tests a potential vaccine on himself to prove its effectiveness. Once the vaccine is confirmed to work, the plane is finally allowed to land at a military airstrip in South Korea.
: Jae-hyuk, a former elite pilot who quit due to severe flying trauma, is on the plane with his young daughter. When the flight's pilots are incapacitated by the virus, he is forced to overcome his fear and take control of the aircraft. The Crisis : Realizing they have nowhere to land and
: Jae-hyuk successfully lands the plane despite low fuel and mechanical failure. The survivors are eventually reunited with their families after being treated. Emergency Declaration (2021)
: A sociopathic scientist named Jin-seok posts a video online threatening a terrorist attack on a plane. He boards flight KI501, bound for Honolulu, carrying a mutated, fast-acting hemorrhagic virus. : Jae-hyuk, a former elite pilot who quit
: As the captain declares an "Emergency Declaration"—a status that should grant the plane priority to land anywhere—the aircraft is repeatedly rejected. Both the U.S. and Japan refuse landing rights out of fear that the virus will trigger a global pandemic.
: Veteran detective In-ho investigates the threat and discovers that his own wife is on the flight. He works desperately with government officials, including Transport Minister Sook-hee, to find an antidote. The survivors are eventually reunited with their families
: Panic also erupts on the ground in South Korea, where citizens protest against the plane's return, arguing that the lives of the passengers should be sacrificed to protect the rest of the population. The Resolution