My flights back from Europe (Paris --> Dallas, Dallas-->San Diego) were really really long. On the second flight, however, having slept for maybe a total of 3 hours in the last 30 hours, I noticed something strange, and I captured it in this video:
Do you see how much blue water came out? Usually there is a lot of suction, but this one just flushed. That was one flush. Think of how many times the bathroom is used on a normal flight.* How many tons of blue water are being sent across the country?
*I recently read an article about how airport security and the resulting "chugging" that goes on as people down whatever water they brought with them, has increased the usage of inflight bathrooms at the beginning of flights. So remember kids, always use the restroom inside of security while waiting for your flight!