A new airport project in Hegang, a rust-belt city near China’s northeastern border with Russia, marks a high-stakes effort at economic revival in a place better known for its cheap housing – where homes once sold for as little as 20,000 yuan (US$2,790), analysts said.The initiative is part of a broader effort to revive the city’s economy after years of stagnant growth, industrial decline and a shrinking population. Hegang’s local population has dropped from about 1.1 million in the 2010s to...