Yes, this powerbank can be taken onto the plane.
According to the Swiss Airlines website, the upper limit for powerbanks is 100Wh. This corresponds exactly to 20000mAh at 5V. The capacity of the Aukey PB-T10 powerbank therefore corresponds exactly to the upper limit.
Powerbanks must be carried in your hand luggage at all airports and may not be transported in your suitcase.
In my experience, I have already pointed out to security officers at several airports that I have "batteries" in my hand luggage. But so far, no one has looked closely.
https://www.swiss.com/us...

Yes, the maximum is 100 Wh (Swiss limit). I have flown with it several times. Important! Be sure to carry it in your hand luggage!