Interestingly, I arrived in Miami last week off a BA flight and could not believe how fast it was to clear Immigration. I commented on this to the Immigration person clearing us and he remarked they are now using facial recognition equipment there and it certainly appeared to speed up the whole process of entering the USA. Of course, it may be different if lots of planes arrives at the same time, or the new technology is used to reduce Immigration officer headcount going forwards, but last week's experience was definitely very positive for me having spent some fair time queueing at various US gateways over the years.