Two airlines, Qatar Airways and Air Arabia, will have limited access to the Stolen and Lost Travel Document database.

BBC: How safe is your passport?

The EU is pushing to bring in a Europe-wide passenger database for air-travel which in future could help track individuals down.

BBC: From Belgian school to Syrian battleground

But Uptake, backed by Shasta Ventures and Trinity Ventures, has a database of 1.8 million travel destinations, hotels, and attractions that it has been building for the past three years.

FORBES: Uptake Brings Friend Recommendations To Travel Search

With a database of over 75 million user reviews and opinions, TripAdvisor is one of the most popular travel review websites.

FORBES: TripAdvisor Snapshot