While the world waits for the 10X battery, a safe, long-range source of flight for our post-Green Flight Challenge fliers, we will probably have to go aloft powered by some bio-fuel derivative or combination of “traditional” fossil fuels and biofuel. Major players in the airline industry are responding to the probability that things will get a bit thin in finding ready, cheap sources of sweet crude, and are taking on not only the issue of using green energy, but of flying more efficiently – ala Green Flight Challenge practices and Voyager-type voyages. This interest by the big players in the industry will probably be good for continuing fuel sources for general aviation, too. With more activity than can be imagined in this arena, your editor turns to two excellent sources for background: Flightglobal.com and Greenair Online.com. Recent reports from both show several major successes, but also much political discord between national interest groups that slow progress. We’ll look at a …