I just came back to The UK, through the 'new' terminal 8 at JFK. This amalgamated BA and American, and other airlines. Perhaps doubling the number of pax. As expected no provision had been made for this increase. And the security line was horrendous. The Fast track, to which I was entitled, had one security person, and a couple of hundred pax. To improve things, TSA approved went through, at the side, and joined the queue in front of us! In 15 mins, I moved 10 feet. Eventually, some of us were directed to to the cattle class line, which had 3 security people. We then all crammed into the lanes for the x-ray machines, only half of which were working! They had the old style, where you had to reach for a box to put your gear in. Absolute chaos, with the usual disinterested staff. Excellent way to spend an hour at the new flagship terminal! Contrast this with the new American terminal at LaGuardia, which is spacious and very nice.
To be fair, at Heathrow, we landed early, BA, and then the airbridge did not work! Eventually steps were brought. However, despite the crowds, it was 6.45am, straight through passport control, using the machines!