You'll probably read breathless headlines about this today: Boeing found in testing a particular Honeywell system with its 737NG jets that the LCD screen went blank momentarily when systems were subjected to more Wi-Fi signal output than a plane full of passengers. This kind of testing is typical, and it shouldn't be worrisome. Modern avionic equipment is hardened against EMF radiation from other sources, and one might guess the Honeymoon component in question needs additional design checking.
This won't affect planes in the air, and doesn't repudiate the testing previously done aircraft model by aircraft model for certifying Wi-Fi use.
Specious Reasoning on In-Flight Electronic Interference
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