Hi Jaime, perfect ideas! have been thinking about this for a long time. How about urging airliners to use sustainable cups, like this one http://www.alibaba.com/product-detail/Eco-Friendly-Biodegradable-Bamboo-cup-For_1960790761.html that even after usage at one point is biodegradable. This same technology could be used for serving dinner on bamboo plates.
And how about serving snacks that aren't packed in plastic?