Install FlightSide like an app (and use it with spotty Wi-Fi)

The times you most need to check a seat are usually the least convenient. A last minute booking, a changed schedule, a layover you did not plan for. Airport WiFi can be unreliable, your phone signal is patchy, and you need to pick a seat before the good ones go.

FlightSide can now be installed from the browser and cached on the device, so it is ready when the connection is not.

Depending on the browser, look for an install prompt in the address bar or "Add to Home Screen" on mobile. It opens in its own window with the FlightSide icon. Updates still roll out normally when a connection is available.

What works offline

The main experience works fully without a connection once the app has been cached. You can pick any two airports, set a departure time and duration, and the sun position, day/night line, and seat recommendation all calculate as usual. The percentage, which side, and the time slider all run entirely in the browser with no network needed.

The map still shows the route and the sun marker. When the basemap cannot load, you will see the route over a simplified land outline instead of the full map detail, but the flight path and sun position are still there.

The journal works a bit like a social feed offline. Posts you have already opened are still there, but nothing new will load until the connection comes back.

The contact form is not available offline. It needs a connection to work, so the page says so instead of letting you write something that will not send.

Install it and load a route before you travel. The full sun and seat calculation will be there even if the airport WiFi is not.