(Note that I didn't mention anything about webservers, or Internet; are you sure the in-flight entertainment systems are separated from the control network by anything else than a firewall rule? See other embedded systems, and how secure they are. Start with...IDK, Toyota's gas pedal code, see how well such safety-critical code was written: https://users.ece.cmu.edu/~koopman/pubs/koopman14_toyota_ua_... )