As you can see I'm never running out of ideas and I wonder what you think of the following one ....

Imagine you are going on a business trip to Asia or you are going on holiday to South America ...... and instead of watching a movie, listening to music or following general information videos regarding your flight you would have the opportunity to watch a movie which teaches you etiquette (international protocol) for your particular destination country.
As a business person I could imagine you would have already received specific training in that regard or you would have prepared yourself thoroughly for it. As a tourist you might have done a bit of research as well. However, an in-depth etiquette course for specific countries on the plane would be something new that could be given to all passengers for free. I would think "wow" and at the same time I wonder why nobody has ever thought about that before. I would consider that as using your time productively. I think there is always something to learn from, whether you might need it for business purposes or just to enrich your own personal general knowledge. Well, etiquette courses could be just the start and the idea of e-learning on the plane could be taken to the next level by offering also other personal development courses "in the air". I wonder what company would be the first one to do so .....

Picture source: http://www.flickr.com/photos/goddrob13/2689676540/