Final answer:
A specialized container called an air tray is required when shipping a casketed deceased by commercial airlines. This container ensures the protection and compliance with airline regulations during transit.
Step-by-step explanation:
When shipping a casketed deceased by commercial airlines, a specialized container, often referred to as an air tray, is required. This container is designed to protect the casket and the remains during transit. The air tray is usually made from sturdy materials like plywood, metal, or reinforced cardboard. It is important that these containers are compliant with airline regulations and capable of withstanding the rigors of travel, which includes handling and shifting atmospheric pressures. Airlines may also demand that the air tray be wrapped in a thick plastic sheet for additional security and sanitation.