Entry formalities USA
The necessary formalities for entry into the U.S. are dependent on many aspects such as nationality, travel reason, duration of stay, and so on … You will find well structured and understandable information on the Internet site of Lufthansa AG: http://www.lufthansa.com/de/en/Data-collection-for-the-USA
You can use the forms available for download (especially the APIS form), regardless of which airline you have actually booked.
For most travelers, who are in possession of a German passport and do not plan to stay in the U.S. for more than 90 days on the row, the immigration formalities should be limited to two important but quite easy to accomplish tasks:
To complete and print the APIS form prior to your departure will save you stress at the check-in desk of your airline. The airlines are in fact legally obliged to forward this information to the appropriate U.S. authority.