Last week's crash of a commuter plane near Buffalo, N.Y., has reopened a longstanding rift between two federal bodies charged with airline safety. Officials at the National Transportation Safety Board complain that their recommendations are often ignored by the FAA, which is the only agency with the authority to enforce safety rules. NTSB Chairman Mark Rosenker cites a 12-year-old recommendation for stricter de-icing requirements on commuter aircraft -- something the FAA has yet to implement. FAA officials respond that NTSB recommendations are often economically impractical or technically impossible.

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