Seeing how many fires have started in planes from smartphones, e-cigs, smart luggage and other small consumer electronics does anyone honestly think that it makes sense to take ebike batteries on a commercial passenger plane? Even if you buy one that can travel now the probabilities are high that more and more of these products will be banned at some time in the future and the amounts that any passenger can bring on will be cut back, so there's no guarantee that they will be allowed in a plane in the future. Rather than risk a fire in a plane just rent an ebike when you get to your destination or send them ahead by a commercial carrier.