Generally speaking, batteries in hand luggage must be less than 100Wh, which is the case with this battery. For information, mine has already been on a plane once and didn't cause any problems at the checkpoint.

Most airlines allow up to 100Wh capacity. This was purposely designed to be just below travels no problem

No, that shouldn't be a problem. Just back from the USA. Just put it in your hand luggage, not in your checked luggage.

Yes, I fly regularly and always have the Prime in my hand luggage, even in the USA it was never a problem.

As others have written, most airlines allow power banks up to 100Wh. This one has 99.54 (also labelled as such below). I am currently travelling with it and have never had any problems. They didn't even want to take a closer look at the powerbank.