Reusing Unpacked Airplane Food

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What if airlnes start collecting unpacked food items from passengers before collecting trays  after each meal? These unpacked items could be sold at half-price to the caterer. Soon, airlines would know the value of left-over food items for evey flight, so they won't have to calculate it any more every time. They just sell it at, say US$50 to the caterer.

Thus airlines and caterers would make additional US$ 50 from every flight, and the World would have less food waste and less food shortage.