The Federal Aviation Administration has issued preliminary separation rules for Boeing's Dreamliner, requiring aircraft landing in the 787's wake to stay at least 10 miles back. In flight, planes cruising at the same altitude as a 787 must remain at least five miles back. The rules, which also apply to the new 747-8 jumbo jet, require up to twice the separation of other aircraft models, presenting a potential challenge at busy airports. The rules might be relaxed once test flights are complete, but are expected to be enforced through October 2011.
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