Depending on your trip schedule, you may be able to use the Lumos Mask during your flight.
Once you schedule your trip, you will see the instructions on your departure day, which contain information on when to use the mask on the plane. Because we are constantly recalculating your light programs based on updated information, your inflight program may change as you use the mask to prepare for your trip. The inflight mask program will show the time when you are supposed to use the mask.
The pre-calculated inflight program does not require internet access to start. However, if you modify your trip information when you no longer have internet access, the inflight program will not work until it has internet connection again. So make sure that you have all your flight information updated before boarding.