On October 5, 2016, a Southwest Airlines Boeing B737-800 flight 3663 experienced a passenger-related incident at Denver International Airport (KDEN). A flight attendant, identified as the ‘B’ position flight attendant, lost her balance while retrieving her carry-on bag from an overhead bin. She fell against a seat arm rest near her right rib area, resulting in a fractured rib. The flight was operated as a 14 Code of Federal Regulations Part 121 domestic passenger flight from Salt Lake City International Airport (KSLC), with 2 pilots, 4 flight attendants and 173 passengers. The injured flight attendant reported she had finished her day in Denver and stepped back to retrieve her bag from the bin when she lost her balance, resulting in contact with an arm rest. A crack was heard in her rib area, making it difficult to breathe.On October 5, 2016, a Southwest Airlines Boeing B737-800 flight 3663 experienced a passenger-related incident at Denver International Airport (KDEN). A flight attendant, identified as the ‘B’ position flight attendant, lost her balance while retrieving her carry-on bag from an overhead bin. She fell against a seat arm rest near her right rib area, resulting in a fractured rib. The flight was operated as a 14 Code of Federal Regulations Part 121 domestic passenger flight from Salt Lake City International Airport (KSLC), with 2 pilots, 4 flight attendants and 173 passengers. The injured flight attendant reported she had finished her day in Denver and stepped back to retrieve her bag from the bin when she lost her balance, resulting in contact with an arm rest. A crack was heard in her rib area, making it difficult to breathe.