The advanced-technology Boeing 747-400 has been certified...

The advanced-technology Boeing 747-400 has been certified for use with Pratt & Whitney engines, Boeing Commercial Airplanes announced. The Federal Aviation Administration approval clears the way for deliveries to customer airlines. The aircraft, which in various configurations will seat about 420 passengers, is scheduled to be certified early this spring for use with General Electric and Rolls-Royce engines.