Below is a list of ATA Cases manufacturers from Markham, Ontario. ATA cases adhere to a generalized set of dunnage specifications laid out by the Air Transport Association. Although ATA cases are not used solely in air transport applications, ATA case manufacturing guidelines ensure that ATA cases are capable of withstanding high-impact transit for the transportation of delicate equipment and are particularly useful in safeguarding fragile items such as medical instruments, computer components and digital hardware.