 At not quite 300 square feet below 40,000, some 10,000 square feet larger than Cathay's year-old flagship Pier Lounge in Hong Kong, the Delta One Lounge is a sprawling space with an ambitious sit-down restaurant, a wellness and spa area, soundproof work pods, and personalized valet services. It's the first of many to come. The airline plans to open smaller Delta One Lounges in Los Angeles in October and Boston in November.