A 38-year-old man hijacked a B737 charter flight from Tenerife to Berlin, attacking the pilot-in-command. He forced his way into the cockpit, attempting to control switches and levers, and threatened the crew and passengers. The autopilot was switched off, and communication with air traffic control was lost. The aircraft ascended to FL400 and descended back to FL365, with the first officer attempting to maintain control. The aggressor was removed from the cockpit and secured in a passenger seat, and the pilot sustained injuries. The flight ultimately ended in Berlin.A 38-year-old man hijacked a B737 charter flight from Tenerife to Berlin, attacking the pilot-in-command. He forced his way into the cockpit, attempting to control switches and levers, and threatened the crew and passengers. The autopilot was switched off, and communication with air traffic control was lost. The aircraft ascended to FL400 and descended back to FL365, with the first officer attempting to maintain control. The aggressor was removed from the cockpit and secured in a passenger seat, and the pilot sustained injuries. The flight ultimately ended in Berlin.