1 Devices with transmission capabilities deactivated (i.e. in flight mode) may be used in-flight once the fasten seat belt has been extinguished after take-off, until the fasten seat belt sign is illuminated for landing.xamples include laptops or personal computers. 1  These devices must have their transmission capabilities deactivated prior to the last cabin door closing in order to be used in-flight. 2  These devices must be stowed in an overhead bin or under the seat in front of you during taxi, take-off and landing.