American Airlines Pet Cargo For passengers traveling with pets, American Airlines offers a pet cargo service for dogs and cats. This service allows pets to travel in a temperature-controlled cargo area of the plane, separate from the passenger cabin. The cost for this service ranges from $200 to $1,000, depending on the size and weight of the pet and the destination. To ensure the safety and comfort of the pets, American airlines pet cargo has several restrictions on the types of animals that can travel in the cargo hold. Pets must be at least 8 weeks old and must have all necessary vaccinations and health certificates. Southwest Check-In Online Finally, let’s take a look at Southwest Airlines online check-in policy. Unlike many other airlines, Southwest does not charge a fee for checked baggage. Passengers are allowed to bring two free checked bags, as well as one carry-on bag and one personal item on board for free.To make the check-in process as smooth as possible, southwest check in online allows passengers to check in online up to 24 hours before their scheduled departure time. This can be done through the airline’s website or mobile app, and allows passengers to select their seat, print their boarding pass, and pay for any additional services,