去美国一定要申请ESTA吗？在天巡上订美国境内机票，提示如下，ESTA是必须申请的吗？毕竟要花14刀。谢谢！！！PLEASE REMEMBER: All passengers flying to the United States or transiting in the United States must have an authorization of the ESTA (Electronic System for Travel Authorization) in their possession. Authorization is o...
