Agreed with the below - LAS entry is normally friendly and efficient given the number of CBP staff and baggage usually arrives quickly too. Also given that there appears to be relatively few US citizens travelling internationally into LAS you don't get the normal 6 officers for US citizens and 1 officer for visitors that you do at some US entry points. Also there doesn't tend to be multiple international arrivals at the same time so you don't get held up by arriving just after another jet when the immigration hall is already full.
Originally Posted by
ag51
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LAS has the friendliest CBP officers of any US airport in my opinion, although there aren't many desks so I suppose there could be queues if you were last off the plane or arrived just after another flight.