I think the draft spelling in the context of a cool current of air is from the US where they only use 'draught' for beer dispensed from a keg or cask - and even that is losing ground to the alternative spelling.
I'm a pedant about many things but I'm usually happy to accept and use American spellings because they generally make sense in relation to the way the word is pronounced.
However, one that I find hard to cope with is 'expiration' instead of 'expiry', as in credit card validity. That's just bonkers!