This is how it works at just about every airport (or terminal depending on the setup / ownership of the airport) in the US. Every so often, the airport authority / gov't entity / airline that controls the terminal will issue an RFP to the handful of companies out there that handle airport retail. Generally the contracts are divided up between Food & Beverage, News & Gift / Specialty Retail, and Duty Free. Generally, one party wins the contract for each each airport / terminal and that contract lasts for some specified period of time (say 5-10+ years), with the winning party agreeing to spend Capex dollars and provide a % of the revenues to the airport / gov't as a rent payment (there are many other nuances to the process). There are a handful of companies that tend to dominate each vertical - HMS Host, for instance, has an exclusive with Starbucks and so tends to dominate in F&B. Hudson Group is the largest News & Gift / Specialty Retailer, and is now part of Dufry, which operates Duty Free stores around the world (only a handful in the US). You don't often find master concession agreements, like the one here. Instead, one party wins F&B, another wins retail, and a third wins Duty Free. Also rare for the incumbent to get unseated - here HMSHost lost out.

In the case of OTG, interesting to note that they were awarded a master concession agreement, but will sublease the Retail and Duty Free (currently operated by Hudson and Dufry, respectively). You can kiss Starbucks goodbye on the F&B side (which IMO is a good thing, but others may disagree). Probably a net positive for F&B options overall, as HMS tends to leverage their market position to deliver a pretty mediocre product. OTG has done an admirable job of chipping away at the industry behemoth with far more limited resources.