On the 737-800 and 737-900 models, how many lavatories are present?

For the 737-800 and 737-900 models, the correct number of lavatories present is four. These aircraft configurations are designed to accommodate a larger number of passengers and to enhance the overall cabin experience by providing adequate facilities.

Having four lavatories allows for better distribution of restroom access throughout the aircraft, particularly during peak times when many passengers may need to use the restroom simultaneously. This arrangement can help reduce wait times and improve passenger comfort, which is especially important on flights of longer duration.

In contrast, other configurations or aircraft models may feature fewer lavatories, which may not meet the demand of passengers as effectively. The presence of four lavatories on the 737-800 and 737-900 models reflects the Boeing design focus on maximizing passenger convenience and minimizing disruptions during the flight.