Online Travel CEO Interview Series

Booking.com is a big-time leader in travel marketing through Google, and Expedia spends a ton of money on search engine marketing, too. While both companies are committed to this type of "pull" marketing, Expedia is making a big bet on multi-device search and "push" notifications as the future of travel booking.

Anytime you can talk to TripAdvisor CEO Stephen Kaufer and the discussion ranges from "Mr. Sharples" at HomeAway to William Shatner, the Trivago Guy and the co-existence of the mobile Web and mobile apps, it is a very interesting conversation.

Hotel site Getaroom.com tried to drive consumers from its Web site to a call centers for up-selling, but the much larger CheapOair is intent on doing both -- perfecting online booking and giving travelers that option, but also prodding them to phone agents in its company-owned call centers.

Steve Singh is one of the most-forward-looking CEOs in the travel industry, and Concur's $150 million Perfect Trip Fund is actively investing in that vision.

Will the immediacy of Orbitz Worldwide's loyalty program redemption be a difference-maker in helping to build its global hotel business? CEO Barney Harford is counting on it.