(1) Two passengers got up from their seats and went into the cockpit because

they heard a gunshot

they heard the pilot call out

the plane suddenly began to shake

they could see people fighting

(2) The unnamed passenger got into the cockpit

with a key

by telling a flight attendant he wanted to meet the pilot

just by opening the door

by kicking the door and breaking the lock

(3) After the unnamed passenger was dragged from the cockpit

he was locked in one of the washrooms

he was given an injection of a tranquilizing drug

he was tied down with a seatbelt

he was forced to lie on the floor with his hands and feet tied

(4) As soon as the unnamed passenger turned off the automatic pilot

the plane began to dive

the plane began flying on its back

the plane’s engines stopped

he plane continued to fly normally for a while