Which of the following aircrafts is NOT suitable for loading live warm-blooded animals?

In determining which aircraft is not suitable for loading live warm-blooded animals, it is essential to consider the cargo specifications and capabilities of each aircraft type. The A330 and B767-300ER/400ER are typically equipped with cargo holds that allow for temperature control, ventilation, and adequate space, which are vital for the welfare of live warm-blooded animals during transport. These aircraft are often used for transporting various types of live animals because they provide the necessary conditions for safe and humane transport.

On the other hand, the A320, being a smaller narrow-body aircraft, typically does not have the same level of temperature control and cargo space, making it less suitable for transporting live warm-blooded animals. Given these considerations, the correct response identifies that options A330 and B767-300ER/400ER are both suitable for this purpose, while the A320 is not, hence correctly highlighting that both the A330 and B767-300ER/400ER are appropriate for loading warm-blooded animals.