Will it one day be possible for climate-neutral planes to fly without leaving contrails? What does the rover that will be used to drill a two-meter-deep hole in Phobos, one of moons that orbits planet Mars, look like? These are just two of the questions being explored at the ILA in the German capital, one of the biggest air shows in Europe. There is little evidence of the current crisis facing civil aviation because of the Iran war , and little talk about the worldwide complaints about high oil