   Apples, oranges and bananas were the fruits I found most
often in airports, but I also found cut-up options like
pineapple and watermelon. Fruits are lower in fat, sodium and
calories than most airport food options. They're also a good
source of vital but under-consumed nutrients like potassium and
folate, and they contain fiber, which may reduce the risk of
heart disease, obesity and type 2 diabetes.   Yogurt is becoming
a more common sight at airports around the country. At Napa
Farms Market at San Francisco International, I even found a
yogurt parfait bar, where passengers could add toppings such as
fruit and nuts to their yogurt. The snack is perfect on the go:
It's portable, easy to eat and relatively healthy. Yogurt
delivers protein (on average, about nine grams per six-ounce
serving), calcium, potassium, magnesium and vitamins, plus
probiotics to aid digestion. A study by the University of
Washington in Seattle also suggests that yogurt may help people
feel fuller than other foods with similar calor