To win over premium passengers, major airlines are one-upping one another with luxurious perks that include pajamas, slippers, bed turn-down service and five-course, chef-created meals washed down with fine wines personally selected by a sommelier. "Korean Air travelers ensconced in its first-class Kosmo Suites dine on fine tableware, nary a plastic fork in sight, their private pods enhanced with sleek wooden accents," Jennifer Brett writes.

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