[fnord123]

>unless you pronounce the word "istoric"

Which we do (in Britain and the rest of the English speaking world outside North America), so "an historic" it is.

e.g. from BBC:

http://www.bbc.co.uk/programmes/p055vr37

[craigds]

In NZ we definitely pronounce it "historic". But that doesn't stop the news anchors from saying "an historic". It sounds ridiculous

[robotmay]

I'm British and I have never personally pronounced it "istoric", and to my knowledge I have never heard anyone pronounce it like that either. Is it a regional thing? I can only recall it being pronounced like that in US TV shows with comedy fake English accents.

"An hour" on the other hand makes more sense, as that is truly a soft H.

[msla]

Just keep in mind the fact that English is a polycentric language means your customs are no more or less correct than any other.