In Hong Kong I've seen a gourmet cheesecake shop selling "Lotus Biscoff" flavored cheesecake, and supermarkets selling Biscoff butter (basically Nutella, but with Biscoff flavoring instead of chocolate).

I know the cookie mainly for being sold at Costco. I had no idea they were given out on flights.

The biggest question I've always had about them was whether the "Lotus" in their name is the same brand as the Chinese supermarket chain Lotus. I think it isn't?