Special light boxes, or flat lamps that simulate natural white light with a blue tint, are also effective, noted Foster, who has been consulting with Delta on the feasibility of introducing such lights into airport lounges.

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Luxury touches for passengers dining in the front of the plane may include saffron, truffles and Scottish smoked salmon, said Michelle Bernstein, who owns two restaurants in Miami, Florida, and serves as a consulting chef for Delta Airlines.

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Prior to working at Delta, he was a vice president with Boston Consulting Group.

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