SIA Cargo operating SHJ to AMS had a unwelcome visitor onboard. At top of climb, the FO stepped back to the Galley and saw a man seating in one of the uppercabin seats. The Captain turned the aircraft back to SHJ while the FO served the stowaway with a meal and drinks. The aircraft landed uneventfully with the visitor well fed and impressed with the inflight service. So much for security.
