In early December, Expedia, Inc. held their annual Partner Conference in Las Vegas where the entire travel industry (or at least those who use Expedia properties which is, like, everyone) gathered to learn the latest and greatest about travel strategies and Expedia offerings.
Part of the conference focused on the offerings from the Expedia Media Solutions group which, in essence, is like a giant ad network for any brand interested in reaching travel demographics. Expedia Inc. owns Expedia, Travelocity, Hotels.com, Orbitz, Hotwire, Trivago and several others. In other words, it's basically everything except booking.com and Kayak. So, yea, if you're a brand looking to tap anything in the travel space, you'll likely be working with Expedia.