Century-old discord is never far from the surface for the two countries, but the latest flare-up risks disrupting stability in the region. We estimate how much the grounded Boeing 737 MAX plane is costing airlines, suppliers and the planemaker itself: about $4bn a quarter. In other no-fly news, Greta Thunberg, a Swedish climate activist, arrives in New York by boat. We examine data showing that she’s not the only Scandinavian with “flight shame”.