Most large airports have contracts with compannies that manage their concessions and you can only have a certain concession say McDonalds if they have an operating agreement with that company.
Here in CLE we have a issue. A few years ago BAA AirMall toook over
the concerssions management from Marriott Host. They have done a nice job adding many new concessions but we lost out Starbucks since they have no agreemeent with BAA. CLE people ask Marriott if they could keep the Starbucks and they said no. We had 3 of them and they were always busy. I wrote the airport director and BAA and asked how come BAA Airmall mananages the connections at BWI and I know their is a Starbucks in the Southwest gate area. I guess we can have a Starbucks at
CLE but would need a seperate contract and this would cost big bucks.