The proposition that this kind of thing at the gate speeds up the whole process for passengers leaving the US is a dubious one. CBP and airlines have a history of making their problems into the passengers’ problems and not capturing the right metrics of greatest relevance to speeding things up for passengers while eliminating extreme variance in times.

Also, FRT has a lousy history of producing excessive false negatives when it comes to reviews of perceived minorities of non-European ethnic backgrounds, and amongst the fishing expedition with a lot of false negatives of course the technology identifies some correctly as being wanted by US LEOs.