I think you'll find that the American "aluminum" has the greater claim to be the "correct" spelling. However, if it's wot millions say...

Another weird one is licorice/ liquorice, (or, up north, liquorish ("lickerish!"). I suspect that the spelling more popular in the US, licorice" is "more correct" if the etymology is consulted, but in the UK it's more likely to be rendered "liquorice." The vulgar-sounding "liquorish/lickerish" actually goes back hundreds of years. If enough people use them, they're all "correct," though some raise hackles more than others. It pays to be not too imperialistic when claiming correctness in a spelling...