Yes. Boeing Onboard Network System (ONS) running on the Network File Server (NFS)?

It and its 787 sibling are highly customized Linux distros.

Aircraft include the 747-8, 787, some 737, ...

http://www.b737.org.uk/flightinstsmax-maint.htm

https://www.teledynecontrols.com/en-us/Product%20Brochures/T...