Boeing did not immediately respond to a request for comment. The FAA's notice applies to certain 737-700, 737-800, 737-900, 737-900ER, 737 Max 8, and 737 Max 9 aircraft. Boeing's website says that ...

The Boeing 737-900ER was a series of logical modifications to the -900 design to make the aircraft more attractive to airlines. Boeing delivered the 737-900 with the manufacturer serial number ...