If you are traveling within the U.S., including Hawaii and Alaska, you do not require a valid U.S. visa or travel signature.
You should always keep your important documents with you:
You probably will not need to use these documents except at places where you may need to establish your identity such as airports, train stations, bus stations, and other transportation hubs.
Make copies: When you are not traveling, you should keep your important documents in a safe place and also make paper or electronic copies of them.
Because San Diego is located near an international border, we also recommend that you carry your passport and I-20/DS-2019 with you when traveling on major freeways (for example, I-5 between San Diego and Los Angeles).
Customs and Border Protection does, at times, set up check points in order to stop and question travelers regarding their citizenship or immigration status.
The Transportation Security Administration (TSA) has prepared a traveler's guide to help ensure passengers have the answers they need to common security screening questions. Find TSA travel information.