8 U.S.C. § 1101(a)(49) (2010) (Title 8—Chapter 12: Immigration and Nationality)
(a) As used in this Act—
(49) The term "stowaway" means any alien who obtains transportation without the consent of the owner, charterer, master or person in command of any vessel or aircraft through concealment aboard such vessel or aircraft. A passenger who boards with a valid ticket is not to be considered a stowaway.