Visiting the U.S. with a valid visa
At check-in in the airport or during the flight, you will receive a white “I-94″ card which the US immigration official will validate upon entry. The card will indicate the duration of stay allowed under that particular visa. Also in this case, the visitor should not overstay the duration of stay indicated. However, it may be possible to obtain an extension of stay while in the USA. Please contact the local Immigration and Naturalization Office for details.