How many murderers were rescued in the air?

Two people. According to Douban film, the real mastermind and murderer of Non-stop are two retired soldiers. It tells the story of an air marshal who was ordered to perform a security task on a plane flying to London. During the flight, he received a threatening message. The sender knows everything about him and asks him to transfer $654.38+$50 million to a secret account, otherwise he will kill a passenger on the flight every 20 minutes. With the help of flight attendants and passengers, the air marshal tried to find out who sent the text message, but things went far beyond his expectation.