International waste encompasses all garbage originating from international flights, which often comes from countries with varying policies and regulations regarding certain types of waste. Also known as quarantined waste (QW), this category of waste carries the potential risk of introducing pests, diseases, and contaminants.

To mitigate these risks, international waste is typically managed separately from other forms of waste, like packaging and food remnants, and is usually incinerated to ensure the elimination of any hazards.