When I went through there was another 2 transatlantic flights boarding and a 747 charter with US troops returning for deployment, Thsnkfully the airport let passengers go through before the troops as they were removing belts and boots etc. In preclearance the paperwork from LCY hadn’t been done prop rly so all passengers with hold luggage had to have a secondary inspection, there was a separate GE kiosk and there were 3 people that used it but the CBP Officer manning the J desk called them in between J passengers. We were ushered to the gate immediately and had to wait a few mins for the cabin crew who were the last to go through