If that plane ever plans to enter US or EU airspace, there is a literal air-gap between the IFE and the flight systems.
> These special conditions are issued for the Boeing Model 787-8 airplane. This airplane will have novel or unusual design features when compared to the state of technology envisioned in the airworthiness standards for transport category airplanes. The architecture of the Boeing Model 787-8 computer systems and networks may allow access to external systems and networks
[1] https://www.federalregister.gov/documents/2007/12/28/E7-2507...
I wouldn’t guess they would add double sensors for all that information.
Or did you mean well protected, instead of literal air gap?
The flight critical systems would be isolated from in-flight entertainment system (IFE). The IFE probably has a listen-only tap to flight metric info on an ARINC databus from the flight computer. I did a quick search and looks like 787 uses ARINC 667, a fiber optic interconnect.
Fiber optic connections aren't required, anything with separate transmit and receive lines can be turned into a data diode (as long as the protocols used permit it). RS232 null modem cables with the RX lines disconnected are a classic.