Originally Posted by
A P Yu
Don't select a flight now for December based on aircraft type. They'll do the winter schedule shake-down in July which often changes things and leads to inevitable disappointment and posts of surprise here
the current sale may possibly be in the thoughts of the OP.
waiting until July will likely not result in the same fares and disappointment greater than not being on the supposed ‘right’ plane type.
OP chose th flight that best suits your plans when you get to JFK (or is better for gettin to LHR on Boxing Day) rather than on a type of plane,