I do not know if it's normal or not. Certainly I don't think I've ever seen 'sic' being used on American spelling like that ever before. It stood out to me as s

I do not know if it's normal or not. Certainly I don't think I've ever seen 'sic' being used on American spelling like that ever before. It stood out to me as strange, and I even remarked to the wife, 'Have you ever seen the BBC add "sic" to American spelling before?' Brits are completely aware that Americans spell things differently, personally I don't feel it needs pointing out. Makes it look like the writer thinks Jack is wrong! Googling "BBC using sic for American spelling" brought me to your comment, and looking at the other results it doesn't look like they do it all the time. Seems silly to have done it at all! I wager it get's edited away before the end of the day.