Final answer:
The number of lavatories on an A319 can vary depending on the airline and configuration of the aircraft, but there are typically about two to three lavatories.
Step-by-step explanation:
An A319 is an aircraft model, specifically a member of the Airbus A320 family. It is a narrow-body, twin-engine jet airliner commonly used for short to medium-haul flights. The number of lavatories on an A319 can vary depending on the airline and configuration of the aircraft. As a general rule, there are typically about two to three lavatories on an A319.