Are kids under 2 years old free for air flight?

Most airlines allow children under 2 years old to fly for free if they sit on a parent's lap, although policies can vary by airline. Some airlines may charge a small fee for infants, while others might require a separate seat to be purchased. It's essential to check specific airline policies when booking a flight. Additionally, infants may not be eligible for certain amenities or benefits that older children and adults receive.