Quelques sites qui donnent des explications sur les e-tickets

http://www.businesstravellogue.com/travel-tips/statue-of-liberty-online-tickets.html

"In addition, you can print your eticket from anywhere. No standing in some will-call line waiting to get in for you. It comes as a PDF file and is similar to etickets used in the airline industry. When you get to the embarkation point, go straight to the security line."

http://www.askwebhosting.com/story/10838/Statue_of_Liberty_&_Ellis_Island_2008_Tickets_Now_on_Sale.html

"Another new feature is the option to print an e-Ticket at home, or in a hotel business center. The PDF document functions similar to the print-at-home option used by the airline industry. Visitors can print their tickets and bring them directly to the security gate at their departure time, bypassing the ticket windows."