The standard 14AH GTR battery cannot be taken onto any plane due to being too large. However, the 4.2AH travel battery (151.2 watt hours) can be taken onto a plane with airline approval prior to boarding. The travel battery can only be stored in carry-on luggage, carry a maximum of 2 pieces per person and you must notify the airline during check-in (or in advance) that you have spare batteries in your possession. Our travel battery is 151.2 watt hours in size and this fits within the 100 – 160 watt hours range.