Walk through any major U.S. terminal at dinnertime and you will see the gap. Travelers who eat well at home end up choosing between a greasy burger, a $14 bagel, and a bag of candy. Meanwhile, the quiet rooms with real food and hot showers sit behind doors most people cannot open. That gap is where airport lounge business development gets interesting, and it is exactly the kind of gap a grocer like Whole Foods Market is built to close.