Originally Posted by
marble
Would it be fair to say that the water from taps on a plane is as good as the water at the destinations it visits? That is, if a plane only ever did round trips between LAX and NYC then I'd be fine drinking the water?
Planes don't fly closed loops such as just back and forth between LAX and NYC so it's a bit of a non-starter, but even if they did, the problem is not necessarily with the immediate source of the water, but the holding tanks on the planes. If bacteria gets into the tanks, it can be difficult to clean them. The bacteria can then build up and contaminate the water that's introduced to the tanks.