Yes, an individual passenger can technically purchase three seats—or an entire row—on a commercial flight, though the booking process can be complex. This is often done by "Customers of Size" who require extra lateral room, individuals traveling with high-value fragile items (like a cello or a vintage instrument), or those who simply want extreme privacy and social distancing. To do this correctly, you cannot simply buy three tickets under your name on a website, as the airline's automated system might flag them as "duplicate bookings" and cancel them. Instead, you usually must call the airline's reservations desk to book "extra seats" (often designated as "EXST" for Extra Seat in the passenger name field). While you must pay the full fare and most taxes for all three seats, you generally do not have to pay the "per-passenger" security fees or certain facility charges for the empty spots. It is important to know that while you "own" the space, you only receive the baggage allowance associated with one person (unless the specific airline policy states otherwise), and the airline may still try to "reseat" you if the flight is overbooked, though you would be entitled to significant compensation.