Originally Posted by
serpens
Perhaps I phrased the question poorly. What I was trying to ask was how often a flight from Heathrow to Newark filled to the point that there were no adjacent seats remaining when it became possible to choose seats without a fee. The answer to that question exists, although perhaps no one on FlyerTalk has the answer and is willing to share it. Nonetheless, if I don't ask, it is almost certain that no one will answer it.
Indeed we need to get nearer the date to be sure, I wouldn't even bother looking at fare buckets or seating maps at this stage. What we can say is that it is not 90% certain that at least 2 seats together, it's a figure lower than that. It's a figure higher than 10% too. Indeed I would suspect it's between 50% and 90% if I had to choose. They may not be the best seats either. However middle seats often work well for couples, and few single travellers will be aiming for those. with the possible exception of night flights on 787s by the bulkheads.