请问美国出海关的问题！！！

are good sams, but do not provide right answers

troyliu answers questions correctly as I observed.
Inbound:(to US)
1)Normally, the pax on international flights into USA will clear customer service at the first airport they arrive at. Then you have to hand your checked luggage back to the airlines.

2)If you miss the connection, you will be put on the late flight to your destination.
If your connection flight is on a different airline, you don't need worry, because there is
an "inter line" agreement among the most major airlines.(not Southwest Airlines)

outbound:(Depart from US):
1)Your luggage will be checked to your final international destination.

2)If you have a connection within the US, you don't need re-check your luggage at the connection airport. Inter line agreement also applies.
If your flight is delayed, your international flight may wait for awhile till you get on the plane, depending the situation.
3)Your international departure reocrd is collected by the last airport you will be at before leaving the US. Certainly, if you have B2,F1 visa, you will hand in your I-94, if you have I-551, you don't have anything to give up.