Phosphoric acid will attack aluminum so please don’t take starsan on an airplane. It would be completely irresponsible. And don’t compare this to the amount in a soda which is like 0.nothing compared to the concentration in starsan.
Are you being serious?
Boeing anodizes all their aluminum in phosphoric acid, and it doesn't attack aluminum oxide very well at all. I guess if you bring 100% consentrated phosphoric onto a plane, remove some of the plastic paneling, scrape the paint off, use a wire brush to remove the oxide layer, and then soak that bare aluminum for several hours you MIGHT get a shiny spot