What is a U.S. Transit Visa?
If you are traveling through the U.S. on a short layover on the way to another country, or if you are a crewmember traveling as a passenger to join an aircraft or vessel that you will be working on, you will need to obtain a transit visa (C visa) prior to traveling to the U.S.
The standard requirements for a transit visa are relatively simple. However, based on your personal situation and the place you will be applying from, additional documentation may be required which can lead to substantial delays.
The most common causes for delays and even rejections are incomplete information on the application, missing pieces of evidence and other legal obstacles. Most of these (though not all) can be avoided easily by working with a dedicated and experienced travel consultant.