<p>An FAA memo shown to CNN concludes that stress was concentrated at the same points on the Airbus A300 tail fins of American Airlines Flight 587, above, and Flight 903, which experienced tail damage over Florida in 1997.</p>
<p>WASHINGTON (CNN) -- In the ongoing investigation into the November crash of American Airlines Flight 587 in Queens, New York, pilots are sounding warnings that the damage to the tail section of another A300 tested for comparison may have been worse than reported.</p>