Yes, a 1-year-old (or any child under two) can absolutely have their own seat on a plane, provided you purchase a full-fare ticket for them. While many parents choose to have their child fly as a "lap infant" for a fraction of the cost (or for free on domestic flights), the FAA and safety experts strongly recommend that all children occupy their own seat in an FAA-approved car seat or child restraint system (CRS). This is significantly safer during unexpected turbulence or in the event of an emergency. When booking, you must select the "Child" passenger type rather than "Infant on Lap." If you do buy a separate seat, ensure your car seat is certified for aircraft use (look for the red text on the label) and that it fits the width of the airline's seats. Additionally, children with their own seats are usually entitled to the standard baggage allowance associated with that ticket, which can be very helpful for families traveling with strollers, diapers, and extra gear.