A flight reservation (often confused with a ticket) is a temporary hold on a specific seat on an aircraft for a specific itinerary. When you make a reservation, the airline's system generates a Passenger Name Record (PNR) or "booking code," which stores your personal and travel details. Crucially, a reservation does not always mean you have paid for the flight; it is a "plan" that holds the fare and seat for a short period (usually 24 to 72 hours). Once payment is processed and the transaction is finalized, the airline issues an e-ticket, which is the actual legal contract of carriage that allows you to board the plane. Flight reservations are commonly used by travelers who need proof of onward travel for visa applications—often referred to as a "flight itinerary for visa"—without committing to the full cost of the ticket. In 2026, most modern booking platforms combine these steps so quickly that the distinction is invisible to the user, but the legal and technical difference remains fundamental to aviation commerce.