A Southwest Airlines Boeing 737-800, registration N8693A performing flight WN-2344 from Phoenix,AZ to Buffalo,NY (USA), was boarding for the flight when a passenger visited the lavatory. Upon exiting the lavatory the passenger bumped into a flight attendant carrying a pot of hot water. The water spilled over the flight attendant causing second degree burns. The flight attendant was taken to a hospital, a replacement flight attendant joined the flight.
The NTSB released their final report concluding the probable cause of the accident was:
passenger bumping into a flight attendant who was holding a hot liquid.
The NTSB described the sequence of events:
On June 12, 2018, at about 1144 MST, Southwest Airlines 2344, Boeing 737-800, N8693A, the "B" position flight attendant was seriously injured when a pot of hot water she was holding splashed on her chest and face after a passenger exiting the lavatory bumped into her during boarding at Phoenix Sky Harbor International Airport (KPHX), Phoenix, Arizona. There were two flight crew, 4 flight attendants, and unknown passengers on board at the time. The flight was operating under 14 Code of Federal Regulations Part 121 as a regularly scheduled passenger flight from KPHX to Buffalo Niagara International Airport (KBUF), Buffalo, New York.
The injured flight attendant was unable to perform duties and was replaced. The injured flight attendant was transported to the hospital where she was diagnosed with second degree burns and released.