Last Saturday, when Warren Buffett's Berkshire Hathaway company revealed that its boffo first quarter was due partly to high returns from its investment in corporate jets, the cycle of irony was finally complete. Buffett, a well known critic of executive perks, has been particularly hard on CEOs who use private jets - that is, until he had his company buy one. At least he had the good humor to name it "The Indefensible."

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