In effect this week is the banning of all wireless gaming devices, (such as the DS or PSP), on Japanese planes. This after a revised law enforcing an earlier ban — passengers were before asked to refrain from using any wireless hand-held consoles.

Apparently the country’s Ministry of Land, Infrastructure and Transport concluded that the “electromagnetic waves emitted by the consoles have the ability to interfere with aircraft navigation systems and other devices.”

Still acceptable, however, are the use of gaming systems that don’t depend on wireless connectivity. Wireless computer mouses and headphones not provided by the airlines have also been banned. No word yet if American planes will implement similar rules.

[Source]