Photo Courtesy of ShutterstockBefore a company can turn ideas into action, they usually look for some financial backing. In the world of travel startups, there are five men that are known for their deep pockets, business savvy and proven success. Brad Gerstner, Sam Shank, Erik Blachford, Rich Barton, and Hugh Crean are the angel investors (as well as founders, chairmen, advisors, board members and CEOs) behind many startups that have since become household names (like Zillow, Hotel Tonight, Expedia, Kayak, and Orbitz), and others that have more recently grown in popularity (like the photo-sharing app, Trover). The 'Fab Five' has also been known to invest in many of the same companies as well as each other's, perhaps proving the saying "great minds think alike" to be true. So if you think you have the next big idea for a travel startup and need some cash flow, credibility, or just some advice, these are the guys to call on. Find out more about them at Skift.com.