I am traveling to LAX, and I thought about flying from Dublin, because it has a preclearance station. This station will give me an immigration and customs clearance, so when I arrive at LAX, I will just exit the plane like I was a citizen (don't have to go through CBP check anymore). To go to preclearance, I have to have an already purchased ticket to LAX from Dublin. Now I have purchased a ticket that flies from Dublin through Amsterdam (Netherlands) to LAX.
If I am precleared to enter the US (without an immigration check at LAX upon arrival), how will they know that I have been precleared, and they have to treat me differently from other passengers who are not precleared?
Upon arrival at LAX, there are two kinds of lanes, one for US citizens (and permanent residents), and another lane for non-permanent residents. Now normally I would go to the non-permanent resident lane and would have to go through CBP check. But in this case being precleared, will i be able to enter the citizen lane?