I've known shopping centre managers in the past. One of their biggest challenges is turf battles between traders in the food court. The chinese shop selling hot chips, the fish and chip shop selling cappuccino.
So at the airport food court the idea of positioning falls away in the face of the hordes, all looking for food. Sumo Salad sells toasties, Krispy Creme sells croissants and coffee, Maccas have an offer.
Sure, positioning is something worth thinking about. But points of parity are important.