Airline pet policies vary by carrier, but most allow pets to travel in the cabin or as checked baggage. Typically, small dogs and cats can fly in the cabin if they fit in an approved carrier under the seat. Each airline has specific size and weight limits, so it's essential to check these details before booking. For pets traveling as cargo, airlines often require a sturdy crate and may have additional health documentation. Some airlines also have restrictions on certain breeds or species, so reviewing the airline's website for their specific pet travel guidelines is crucial for a smooth journey.