A Greece Passenger Locator Form is necessary if you're traveling to Greece and need to comply with local path and trace requirements prior to boarding the airplane. The form can be filled out in person or by mail, fax or e-mail. In either case you'll be asked to provide proof of your identity, a current picture and a copy of your passport. You will also be asked to declare in which you live and any other location which you would love to travel to Greece. A PLF is a legal document that proves that you have lawfully traveled to Greece and received the essential travel documents.