A Greece Passenger Locator Form is required if you're traveling to Greece and must comply with local route and trace requirements before boarding the airplane. The form can be filled out in person or by email, fax or e-mail. In any case you'll be requested to provide evidence of your identity, a recent picture and a copy of your passport. You'll also be required to announce where you live and any other location that you would love to travel to Greece. A PLF is a legal document that demonstrates you have legally traveled to Greece and got the necessary travel documents.