When must I obtain a visa to travel to the United States?

• If you intend to arrive in the United States aboard an aircraft that is not a signatory.
• If you intend to visit the United States for more than 90 days.
• If you believe that any grounds of inadmissibility under INA § 212(a) apply to you, you should apply for a nonimmigrant visa before traveling to the United States.
• If you are traveling to the United States for a purpose other than short-term tourism or business.