NEW YORK ( TheStreet) -- The Federal Aviation Administration has proposed a $1.45 million fine against Delta's ( DAL) Northwest Airlines for operating a number of its Boeing ( BA) 757 aircraft without proper windshield wiring inspections.

The FAA states that Northwest, before it was acquired by Delta, wrote maintenance instructions for its mechanics in April 1990 that omitted the required inspection of the wires under the first officer's window. Consequently, 32 of the carrier's 757s flew more than 90,000 passenger flights between Dec. 1, 2005 and May 27, 2008 out of compliance.
North West Airlines

The FAA says Northwest has 30 days to respond to its notice.

The agency also states that on May 28, 2008, Northwest discovered it hadn't performed the proper inspections and revised its maintenance instructions -- but the company didn't require the work to be carried out until further flights had occurred. As a result, says the FAA, 29 aircraft flew 42 passenger-carrying flights while they were still out of compliance.

-- Reported by Andrea Tse in New York

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