Only 40% of Americans have a passport, according to official statistics. It's why Australian airline Qantas has come up with a marketing campaign to lure Americans to come Down Under by paying for their passports. The airline is offering a $135 discount on its fares to Australia, which is the same cost as getting a U.S. passport. The U.S. is the fourth largest source of inbound travelers behind the UK, China and New Zealand.