I came across TravelerToken recently and I really like their project. They are not the only ICO working in this particular industry but their project stands out from the others. Simply put, they are going to leverage the blockchain technology in order to simplify online booking.
But here's what makes them stand out of the crowd (I really spent so much time in order to get to this conclusion that must be definitely shared with the community).
The majority of the ICO working in the travel industry are relying on public blockchain platforms which are well known for scaling and performance issues and of course, they are single businesses.
TravelerToken is not a single business but a consortium aiming to build their own blockchain technology which will enable to minimizes costs for customers and maximize profits for providers.

Definitely, have a look at their whitepaper for further information https://www.travelertoken.com/. I would also recommend joining their telegram (https://t.me/travelertoken) chat 'cause they really help you with any queries you might have.