Having read your tale, I'm afraid that you should file this episode under "very expensive lesson learned". You have no recourse against the airline. Why would you indicate to a complete stranger that he could use your laptop? You are opening yourself to trouble. The fact is that what happened comes down your seatmates' word against that of the teenager and his mother - if you can find them. I'm not doubting your version of events. But you have no one to blame but yourself.