Departing the United States After Travel to USA
Paper I-94 form has been eliminated effective May 2013. CBP will record the departure electronically via manifest information provided by the carrier or by CBP. Therefore, no action is required from you regarding I-94 form.

When you reach the airport, proceed to the departure area, which may be on a different floor than the arrival area. Unload your bags from the car. There are helpers to take your bags to the airline counter. If you use them, you should tip them. Otherwise, you can rent a trolley (usually $5/trolley) and load all the bags on that.

Proceed to the airline counter. There are various lines for different class passengers such as first class, business class and economy class. Depending upon your frequent flyer miles status, you may be able to use the premium class line even if you are traveling in economy class.

Show the passport to the attendant at the counter. He/she will check that you are eligible to fly to your destination. If you are going back to your country of citizenship, you can obviously are eligible to travel there. However, depending upon the airline and your visa status in the US, you may be required to get a transit visa at the layover where you would change the flight, even if you are not getting out of the airport.

Airline attendant will ask you to place your checked in bags on the weighing machine one by one. If they are within the weight limit, they will put the tag for final destination. Otherwise, they will ask you to remove some of the belongings or put in another bag, if it has lower weight.

You will be issued one or more boarding passes to the final destination, usually for all the legs that are part of your ticket.

No tags are required for the carry on luggage.

Once you have your boarding pass, you will proceed to the security lines. Depending upon class of your travel, there may be different lines. The officer will check your boarding pass and the passport. You will have to put your carry on luggage through X-ray scanning machine. Even if you have TSA-Pre status for domestic travel, that would usually not apply for international travel. That means, you will have to remove your shoes and jacket. You will have to remove laptop, tablet and larger electronics from the bag and put in separate tray. You should remove keys, cell phone or other items from your pockets into the carry on bag before it goes through X-ray.

Once you have cleared that step, you can simply proceed to the gate. The gate may be in the same terminal or different one. You may be required to take train or other means of transportation for the same. Premium class passengers can wait in the lounge alternatively.

When it is time to board the plane, airline staff will call passengers by the group numbers. When it is your turn, you will proceed to board the plane and go to your assigned seat.

Sometimes, before you board the flight, US customs officer may stop you randomly and ask questions about where you are going, why you are traveling, how much money you are carrying and so on. Don't be afraid. You are not targeted specifically but were randomly select.

Enjoy the flight.