According to BA only one flight out of jfk is cancelled at the moment- the BA 176 at 19.40
3 other flights are scheduled to leave jfk for heathrow this evening (BA112,176 and 114) and 2 others to london city- people on BA 176 should rebook through BA- see their website. The 3 flights earliest flights from London to jfk have been cancelled today. It could be worse!
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