Question about Anker PowerCore 24K, 737, 140W

There is no general answer to this question. The rules of the respective airline must be observed. As these are not uniform worldwide, there is no general yes or no.

In most cases, you will come across a limit of max. 100Wh (approx. 27,000mAh).

But may. To be on the safe side, check the airline's website.