No, in 2026, you cannot board a plane with just a printed or digital itinerary. An itinerary is simply a summary of your travel plans; to board, you must have a Boarding Pass, which is only issued after the check-in process is complete. However, the term "itinerary" is still critical for 2026 international travel as Proof of Onward Travel. Many countries and airlines now strictly enforce rules requiring you to show a "live" PNR (Passenger Name Record) or a verified onward ticket before you are even allowed to board your first flight. In 2026, simple PDF "itinerary builders" are often rejected by immigration officers who now use integrated software to verify if a seat is actually being held in the global reservation system. To avoid being denied boarding, you must ensure you have either a confirmed return ticket or a "verifiable dummy ticket" that shows an active booking reference that an agent can check on their screen to prove you intend to leave the country.