[Sebb767]

It seems very likely to me that they carry more than 1L of fluid per passenger, plus there's also the crew. So yes, they could :)

Of course, if they dump all their drinking water, it'll be hard to reach the maximum pee capacity per passenger. But you could always resort to dumping food.

[ethbr0]

Each one of us carries about 5L of fluid... it's just kind of mission-critical.

[Sebb767]

Well, if we go down that route, you could just as well dump a few passengers down there. But I guess that wasn't the spirit of the above question :)

Allthough the motivation for overfilling a plane waste tank seems dubious overall, so who am I to judge.

[markus_zhang]

I'm thinking about the alcohol and soft drinks on plane. But maybe they don't have much on board.