Yes, a 2-year-old can fly, but the "rules of the sky" change significantly once a child reaches their second birthday. Unlike "lap infants" (under 2), a 2-year-old is legally required to have their own purchased seat and a full-price (or child-discounted) ticket. They are no longer allowed to sit on an adult's lap during takeoff and landing. In 2026, airlines like IndiGo and Delta require a valid proof of age (like a birth certificate or passport) at check-in to verify the child's status. It is a peer-to-peer "pro-tip" to consider bringing an FAA-approved car seat for the flight; while not mandatory if the child can sit upright, it provides a much more familiar and secure environment for a toddler, especially on long-haul flights where the standard airplane seatbelt might feel too loose or uncomfortable.