The Airlander 10 is the largest aircraft in the world, originally designed in 2010 to be used for surveillance and reconnaissance by the US Army. But budget cutbacks and delays grounded the project in 2012, and in 2013 it was bought back from the US by the original design firm, the UK-based Hybrid Air Vehicles (HAV). Now, a new £3.4 million grant from the UK government could help it off the ground next year, according to HAV.