PaulAbby

Your Aunt should check her bags to her final destination which will be St Louis.
Your Aunt will arrive in Detroit where she will deplane and everyone on the plane will be directed to Immigration(This will be her POE). She will need to get in the line for non USA citizens. There she will go through "immigration" where they will look at her passport, visa, ask questions,etc. Once she finishes imigration she will be at the baggage claim area where she will need to get all her bags and go through Customs.
At Customs you may just give the filled out customs card to the agent, or they have the right to pull her aside and have her open any or all of her luggage to make sure she is not bringing in to USA anything that is prohibitive. (see other posts on what she should not bring).
After going through customs with all her luggage she will then be directed to the "connection" or "to leave Airport". She will need to go to the "connections" side where she will then be able to drop her checked luggage to some airport personnel so then the luggage will arrive in St Louis and can be claimed at baggage claim. The personnel should look at the luggage tag that is still on the checked bags to make sure it shows St Louis as the final destination.
Right after this area there should be some monitors that will show all the domestic flights and she will be able to look to see what terminal/Gate the plane to St Louis will be at. If She is flying with Delta to St Louis then she will probably stay at the international or McNamara terminal. If she is flying with any other airlines then she may need to get on the "Shuttle Service" to go the the "North Terminal". The Shuttle leaves every 7 minutes and there should be signs directing her to the Shuttle service. There should be airport personnel, or ask (or show her ticket) to someone, and they should be able to assist her to get to the correct gate.

Your Aunt should check her bags to her final destination which will be St Louis.
Your Aunt will arrive in Detroit where she will deplane and everyone on the plane will be directed to Immigration(This will be her POE). She will need to get in the line for non USA citizens. There she will go through "immigration" where they will look at her passport, visa, ask questions,etc. Once she finishes imigration she will be at the baggage claim area where she will need to get all her bags and go through Customs.
At Customs you may just give the filled out customs card to the agent, or they have the right to pull her aside and have her open any or all of her luggage to make sure she is not bringing in to USA anything that is prohibitive. (see other posts on what she should not bring).
After going through customs with all her luggage she will then be directed to the "connection" or "to leave Airport". She will need to go to the "connections" side where she will then be able to drop her checked luggage to some airport personnel so then the luggage will arrive in St Louis and can be claimed at baggage claim. The personnel should look at the luggage tag that is still on the checked bags to make sure it shows St Louis as the final destination.
Right after this area there should be some monitors that will show all the domestic flights and she will be able to look to see what terminal/Gate the plane to St Louis will be at. If She is flying with Delta to St Louis then she will probably stay at the international or McNamara terminal. If she is flying with any other airlines then she may need to get on the "Shuttle Service" to go the the "North Terminal". The Shuttle leaves every 7 minutes and there should be signs directing her to the Shuttle service. There should be airport personnel, or ask (or show her ticket) to someone, and they should be able to assist her to get to the correct gate.

Hi Ron and welcome to VJ. You mentioned that you have already seen a lawyer and the cost involved. You may consider not using the lawyer as we have gone through the K1 process without having to pay a lawyer for their services. The information here in the VJ guides, along with the advise from many that have already gone through this process, gave me the information necessary that we had no problems, or additional requests for information from the immigration personnel. I also felt very confident with the process because of the information on VJ.
You still must be very diligent when you are putting together all of the documentation. And the process is very expensive, even without the cost of a lawyer. So if you are good at details and you and your fiance do not have any history that may cause the immigration officers to dig deeper, you may save some money and consider doing this yourself (with the assistance of VJ).
For other VJ members please give your advice one way or the other.
Paul