Miami Herald (1/24) Grounding of Airbus fleet urged. Ten weeks after the crash of American Airlines Flight 587, more than 60 American pilots who fly the A300 have signed a letter recommending that the carrier ground its A300 fleet. Unsure of the safety of the aircraft, the pilots say the A300 should not be flown until investigators determine a cause of the crash or develop a reliable way to test the structural integrity of the planes? vertical stabilizers. The tails are made of thin layers of carbon composite fibers. American defended the safety of its 34 A300s, emphasizing that neither the Federal Aviation Administration nor the National Transportation Safety Board has suggested any reason to ground the fleet.