To get a passport to travel in the United States, fill out and submit the U.S. passport application and provide a passport photo, explains the U.S. Department of State Bureau of Consular Affairs. The exact method of getting a U.S. passport depends on the applicant's age and whether the applicant is applying for the first time or renewing a passport. As of 2015, passports are not necessary for U.S. domestic aircraft travel, states the U.S. Department of Homeland Security.
To apply for a passport, provide proof of U.S. citizenship, the Social Security number and a photocopy of personal identification documents along with the application fee, according to the U.S. Department of State Bureau of Consular Affairs. Those applying for their first U.S. passport, those who are under the age of 16 and those who can't provide legal documentation for a name change must apply in person. Do not sign the application until the acceptance agent advises it.
The U.S. Department of Homeland Security reports that enactment of new restrictions on boarding an aircraft within the United States without passports won't take place until the public gets at least 120 days notice. The restrictions are related to the REAL ID Act of 2005, a phased effort to standardize travel documents in order to curtail terrorists from using fake identification when traveling in the United States.