Online check-in Tantalus Air - https://www.check-in.site

I'm sorry, but I couldn't find any specific information about an airline called "Tantalus Air" as of my knowledge cutoff in September 2021. It's possible that this airline is relatively new or a regional carrier that hasn't gained widespread recognition. It's also possible that the name has changed or that it operates under a different name. If you have any additional details or if there's something specific you would like to know, please provide more information, and I'll do my best to assist you.