Just checked out flights to MIA 19-22 December and the 207 and 209 are all pretty much like this:

F0 A0 J9 C9 D9 R2 IC W6 EC TC Y9 B9 H9 KC MC LC VC SC NC QC OC G0

While I expected them to be busy, it's early May and there are not even any F seats on 19 December. I've done this route a few times at this time of year, even booking in May and being able to UUA to CW, but it was showing as over £1300 for just the outbound when I looked last night. Is there something going on in MIA that weekend? Going via ORD was less than half the price.