No, a flight itinerary cannot be used as a ticket to board an aircraft. An itinerary is simply a document that lists your flight details, such as flight numbers, departure times, and confirmation codes; it is essentially a "summary" of your travel plans. To board a plane in 2026, you must have a valid boarding pass, which is issued only after you have "checked in" (either online or at the airport) and your documents have been verified. While a "confirmed itinerary" is often used as "proof of travel" for visa applications or at immigration checkpoints, it does not represent a reserved seat in the eyes of the gate agent. You should always ensure you have the actual boarding pass (either printed or on your phone) before heading to the security checkpoint, as the itinerary alone will not grant you access to the sterile area of the airport.