On April 14, 2017, about 1600 eastern standard time, JetBlue Airlines flight 240, an Embraer E-190, N373JB, encountered turbulence during approach to land at Orlando International Airport (KMCO), Orlando, Florida. One flight attendant sustained serious injuries. The airplane was not damaged. The flight was operating under the provisions of 14 Code of Federal Regulations Part 121 as a regularly scheduled international passenger flight from Lynden Pindling International Airport, Nassau Bahamas. The captain stated that, during the approach to land, the passenger seat belt sign was illuminated and that he could see a scattered/broken cumulous layer of clouds between about 8,000 and 10,000 feet. He expected to encounter turbulence, so he called the flight attendants and told them it was going to be bumpy during the descent and that they were to sit down. Shortly after, the airplane encountered moderate turbulence for about 4 to 7 seconds. A flight attendant then informed the flight crew that one of the aft flight attendants had fallen. After landing, the flight attendant was transported to the hospital where she was diagnosed with a broken fibula.