Final answer:
Lavatories on international flights are checked and maintained regularly to ensure cleanliness and functionality.
Step-by-step explanation:
The frequency of checking lavatories on international flights can vary depending on a few factors, such as the airline's policy and the duration of the flight. In general, lavatories are checked and maintained regularly throughout the flight to ensure cleanliness and functionality.
For example, on long-haul flights, lavatories are usually checked multiple times during the flight, especially after meal services or during scheduled breaks for the flight crew. On shorter flights, the lavatories may be checked less frequently, but they are still inspected at regular intervals to ensure they are stocked with necessary supplies and in good working condition.
It's important to note that the specific frequency of lavatory checks may vary from airline to airline, so it's always a good idea for passengers to follow any instructions or guidelines provided by the flight crew regarding lavatory usage.