Internet Explorer and Firefox offers an online mode that allows us to auto save copy of the web pages you browse using the internet and display them locally when you are not connected to the internet. Thus if you are offline in a flight, you can still browse the web pages that you accessed when you are online.
Offline Browsing Through Google Chrome
The recent versions of the google chrome also support offline browsing through the option to easily access hidden cached version of any web page.
While inside google chrome, type chrome://flags/ to access the experimental features page and search for "Enable Offline Load Stale Button" option. Click enable on this option and restart your browser.
Now if you are offline, your Chrome browser will give you an option to load the “stale copy” if the page you are trying to access is available in the local cache.
Google Chrome caches the HTML content, images, JavaScript and the CSS style sheets associated with a page so your offline copy should not look very different from the original. However, if there are resources that require an active Internet connection, like JavaScript widgets or videos, they’ll be replaced with placeholder images.
To test the feature, open any page inside Chrome, turn off your Wi-Fi or disconnect the Ethernet cable, and restart the browser. If the offline mode is enabled, the cached version of the page would show up on your screen.

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