<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by TomCayman:
MIA/LHR is nearly always chock full..in coach...and they often roll cabins...Op Upgrades are not unknown on that route 
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It was also a weekend flight, so double whammy. I flew it on Mar 10th, a Monday and the most of the centre J seats were empty as well as a few rows. Y looked moderately busy, but not packed.