What might small animals require for flying within the US?

Small animals that are traveling, particularly by air, often require a health certificate to ensure they are fit for travel and free from diseases that could pose a risk to other animals or humans. This certificate is typically issued by a veterinarian and confirms that the animal has received appropriate vaccinations and is health compliant for travel. It's a crucial document that airlines and authorities may require to prevent the spread of illness and to ensure the safety and well-being of the animal during transport.

While travel insurance, feeding instructions, and emergency contacts may also be relevant considerations, they are not mandatory requirements for flying with small animals in most cases. Travel insurance can provide peace of mind for pet owners, but it is not a formal requirement. Feeding instructions can help caregivers keep the animals nourished, but they do not address health or safety concerns necessary for travel. Emergency contacts are useful in case of unforeseen circumstances, but again, they do not serve the critical purpose that a health certificate does for traveling animals. Thus, the health certificate is the key requirement for ensuring safe travel for small animals.