Tidbits for travelers: connect at the airport 08/07/11DFW introduces discounts via Foursquare and Facebook Places check-ins; ATL and TSA using QR codes. → Airports/Layover/Mobile phones/Restaurants/Shopping/Travel tipsATL/Dallas/Fort Worth airport/DFW/discounts/Facebook Places/Foursquare/Hartsfield-Jackson Atlanta International Airport/QR codes/TSA