To increase efficiency, reduce operating costs, and streamline the admissions process, U.S. Customs and Border Protection (CBP) has automated the Form I-94 at air and sea ports of entry. The paper form is no longer provided to a traveler upon arrival except in limited circumstances, and at land ports of entry. Travelers are given a CBP admission stamp on their travel document. If a traveler needs a copy of his or her status or I-94 (record of admission) for verification of alien registration, immigration status, or employment authorization, it can be obtained from https://I94.cbp.dhs.gov.
This fact sheet contains frequently asked questions about the I-94 (record of admission) automation.
CBP Publication No. 1496-0721