A Greece Passenger Locator Form is required if you are traveling to Greece and must comply with local route and trace requirements before boarding the airplane. The form could be filled out in person or via mail, fax or email. In either case you'll be requested to give proof of your identity, a recent photograph and a copy of your passport. You'll also be required to declare in which you live and any other location which you would love to go to Greece. A PLF is a legal document that proves you have legally traveled to Greece and received the essential travel documents.