Following the diversion of BA114 New York JFK – London Heathrow to Halifax in the early hours of this morning, British Airways Boeing 747-436 G-CIVI positioned Boston – Halifax as BA9153 this evening after arriving as BA203 from London Heathrow in order to take over the diverted BA114, routing Halifax – London Heathrow as BA9609. As a result BA214 Boston – London Heathrow was cancelled.