[cutemonster]

Time to consider instead: walk through the plane, look angrily at the other passengers, one at a time, asking: "Do you use 192.168.x.y?". That can solve the problem

[brookst]

Or convince the flight attendants to including “MAC address spoofing” in the spiel about destroying or tampering with lavatory smoke detectors.

[daveevad]

Presumably there is a way to find out which other wireless client is impersonating another in a confined environment like an airplane.

A multicast packet might vary based on physical distance to the imposter?