exposure to ill passengers, toxic uniforms, toxic cabin air, radiation exposure, and other issues were causing them to be sick. In January 2019, two pilots and three flight attendants on Flight 1897 from Philadelphia to Fort Lauderdale were hospitalized following complaints of a strange odor. Discrimination complaints On October 24, 2017, the NAACP issued a travel advisory for American Airlines urging African Americans to "exercise caution" when traveling with the airline. The NAACP issued the advisory after four incidents. In one incident, a black woman was moved from first class to coach while her white traveling companion was allowed to remain in first class. In another incident, a black man was forced to give up his seats after being confronted by two unruly white passengers. According to the NAACP, while they did receive complaints on other airlines, most of their complaints in the year before their advisory were on American Airlines. In July 2018, the NAACP lifted their travel advisory saying that American has made improvements to mitigate discrimination and unsafe treatment of African Americans. Accidents and incidents As of March 2019, the airline has had almost sixty aircraft hull losses, beginning with the crash of an American Airways Ford 5-AT-C Trimotor in August 1931. Of these most were propeller driven aircraft, including three Lockheed L-188 Electra turboprop aircraft (of which one, the crash in 1959 of Flight 320, resulted in fatalities). The two accidents with the highest fatalities in both the airline's and U.S. aviation history were Flight 191 in 1979 and Flight 587 in 2001. Out of the 17 hijackings of American Airlines flights, two aircraft were hijacked and destroyed in the September 11 attacks: Flight 11 crashed into the north facade of the North Tower of the World Trade Center, and Flight 77 crashed into the Pentagon; both were bound for LAX from Boston Logan International Airport and Washington Dulles International Airport respectively. Other accidents include the Flight 383 engine failure and fire in 2016. There were two training flight accidents in which the crew were killed and six that resulted in no fatalities. Another four jet aircraft have been written off due to incidents while they were parked between flights or while undergoing maintenance. Carbon footprint American Airlines reported total CO2e emissions (direct and indirect) for the twelve months ending December 31, 2020, at 20,092 Kt (-21,347 /-51.5% y-o-y). The company aims to achieve net zero