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Travel Tips for first time travelers to USA  

I came from Bangladesh and my port of entry was John F. Kennedy (JFK) International Airport. So my writing is based on my experience.  

When you will arrive at Dubai/Hongkong/Doha/China you have to check the "gate number" of your next flight on the big screen. You will be able to see the flight number, gate number, departure time, destination airport etc. You can check any last minute change here. If you have a long layover the gate number may change over time. So you have to check it again before boarding. Its wise to take rest anywhere near the gate of your next flight.

If you have to catch another connecting flight (from USA) then inform it to the custom officer. In my case the officer transfer me to another line where there were only 2 people before me. If you reach in peak- hour you have to wait in a long queue to complete immigration formalities. So if you think that you may be late standing in the regular line just talk to the officer. No one told me to do so but I did not take any risk. As it is your first time entry it may take longer. So don't take risk if you have less than 3.5 hours in hand.

After completing immigration process you have to collect your luggage. At most airports in USA, unlike in Bangladesh/India, luggage trolleys are not free. I don't know about other airport but in JFK you can rent trolley for $6. I had $100 notes. So I had to ask for changes. So If possible, carry some quarters/$1 with you. If the booth of your domestic flight is near by then it will be easy. But my domestic flight was from JetBlue and I had to go to another terminal. So I asked someone the direction of terminal 5. I thought it would be walking distance. But I was wrong. That person told me to catch air train to go to terminal 5. At that time I had no idea that I had to use air train to go to another terminal. From where I can ride an air train and how much does it cost? No one told me about these steps. I did not have any Deshi travel partner as well :( On my way to air train stoppage I asked another person just to make sure that I was in right direction :) As far as I can remember the stoppage of the air train was not in the same floor and at first I went to the wrong floor. So sometimes you have to use elevator. And of-course you have to walk with your beloved 53+kg luggage and backpack. But at the same time you will be happy to know that there is no hassle of buying air train ticket. Its free for passengers who want to go to other terminals. If you still have confusion about air train you can search in YouTube. I wish I could check before my departure.    

There are many self Kiosk to print the boarding pass of your domestic flight. If you don't like self service ask for assistance. Airlines crew are available there. They will take your check in luggage and you are ready to board on your next flight.

As you have already completed your immigration process you just have to collect your luggage in the final destination. No other formalities. Now you are free :) Have a safe journey.
If you have any question you can ask in the comment section.