The volcanic troubles in Hawaii refuse to abate. It has been two weeks since eruptions began at Hawaii’s Kilauea volcano, with the latest gigantic eruption last Thursday sending a further slew of ash 30,000ft (9,100m) into the sky, news that will cause consternation for a global airline industry that has been here before. You may remember Iceland 2010, when almost 20 countries closed their airspace to commercial aircraft traffic, affecting circa 10 million travellers over ash concerns. Volcanic ash plays havoc with airplane engines and must be avoided like the plague. Hawaii’s biggest island is effectively becoming a no-fly zone, because airlines don’t have enough reliable wind, weather, and ash data to safely operate in that airspace.