Just be aware that with the WiFi off some features are not available. For example, the Wikipedia tab in the dictionary look up window will be blank except for a statement telling you it doesn't work in Airplane mode. The X-Ray feature will also be unavailable. I suspect other features won't work without WiFi too. If you don't use these features very often, then Airplane mode is an option. If you use these features often, then Airplane mode is a PITA as it takes a several touches of the screen to turn it ON/OFF. Too bad Amazon won't give us a one-touch ON/OFF ability for Airplane mode.