British Shorthair cats cannot be checked in as baggage because they are a brachycephalic breed. While their noses aren't as severely short as some other breeds, they are still relatively short and flat. This naturally shorter nose makes them prone to loud breathing sounds and difficulty breathing, increasing the risk of suffocation due to lack of oxygen during transport. Therefore, most airlines do not allow them to be checked in as baggage.

Which cats cannot be checked in as luggage?
Besides British Shorthair cats, other breeds such as Garfield, Persian, Himalayan, Burmese, and Scottish Fold cats are also prohibited from being checked in as baggage. Additionally, cats under 8 weeks old, pregnant cats, and cats within 7 days of giving birth are also prohibited from being checked in. Regulations may vary slightly between airlines; it is recommended to contact the specific airline by phone for details.