AS every air traveler knows, one of the massive deterrents to flying is the walking it involves. With the coming of the jets and the extra space their blasting exhausts require, airport acreage has multiplied, and the problem has become worse. The hike from check-in counter to the farthest reaches of the San Francisco International Airport is more than a quarter of a mile, or twice around a football field at a nonjog trot. Puffed one woman soon after Atlanta's new $20 million airport opened in May: "I declare, if they had told me...
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