Entering the U.S. by Air or Sea: Electronic Form I-94
Beginning April 30, 2013, in order to increase efficiency, reduce operating costs and streamline the admissions process, U.S. Customs and Border Protection (CBP) has automated Form I-94 at air and sea ports of entry. The paper form will no longer be provided to a traveler upon arrival, except in limited circumstances.
The traveler will be provided with a CBP admission stamp on their travel document.
If you are entering the U.S. by air or sea, both of the following should occur:
The CBP officer should stamp your passport, indicating your date of entry and visa status granted (such as: F-1 - D/S, J-1 - D/S).
You should be issued an Electronic Form I-94 available on the CBP website. Please check this website, make sure your arrival information is correct, and print the record. See below for what mistakes to look for.
The official guidance from CBP can be found in the I-94 Automation Fact Sheet (PDF).