What should be done with non-perishable catering supplies?

Non-perishable catering supplies should be properly stored or locked up to ensure they remain safe and usable for future flights. Proper storage is crucial in maintaining the quality and hygiene of these items. If these supplies are left unsecured, they could become contaminated, misused, or damaged, leading to potential safety or health concerns. Securing them helps maintain a clean and organized environment on the aircraft while also ensuring that resources are not wasted and can be utilized for subsequent services.

Returning them to a catering company or disposing of them unnecessarily would lead to waste, and leaving them in the cabin could result in unforeseen issues related to cleanliness and order. Therefore, securing non-perishable supplies is the most appropriate and responsible action.