You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract Luxury Flash-Sale Sites Take On the Travel Sector Why Rue La La, Hautelook, Gilt Groupe, Others Are Expanding Offerings to Include Vacation Deals By Erin Jo Richey, Published on February 03, 2011 0 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Become a Member Already a member? Log in.