In a roundtable discussion, the leaders of seven of the largest airport concessions companies share their thoughts about competition, leadership and innovation. Canadians are making the trek south of the border to take advantage of lower airfares. Whether proprietary or designed by a third party, mobile apps are giving airports a new way to communicate with passengers. Wine bars at airports throughout the country are answering the demand for higher-end wines. Consolidated rental car facilities make things easier for travelers by putting all of the companies in one centralized location.