Anyone know the reason for BA substituting their B787 for a B777 on BA93 to YYZ over the last two days? Not another technical glitch is it?
Going back to the OP's question, with one of the four 787s having been out of service since 21 October, the only way that a second Newark 787 rotation could be introduced with the Winter schedule on Sunday would have been to take the aircraft off one of the two Toronto rotations (presumably temporarily).