Since Labor Day, I have been flying a lot of JFK/MIA/SJU on what is typically the off times and I am still hearing "this is a very full flight" from the FAs. In October, I flew JFK/EZE and both ways were 100% full. Flights that I have done to DFW and LAX have easily been over 80%.
When I am stuck in Y, I'd like to see some of these less than 50% full flights.