Important Notice: According to Section 215 of the U.S Immigration and Nationality Act (8 U.S.C. 1185) it is illegal for an American citizen to enter or leave the U.S on anything other than an American document. This applies to dual citizens as well, meaning that persons holding e.g. both Swiss and American citizenships MUST enter and leave the U.S. on a valid U.S. passport; they may NOT enter/leave the U.S. on a Swiss passport. This applies to children as well as adults.