As high fuel prices and disruption from the Middle East conflict force many Asian carriers to cut capacity and rearrange routes, Singapore Airlines (SIA) is moving in the opposite direction: adding long-haul flights to Europe in a bid to capture traffic from its Gulf rivals.Aviation analysts said the carrier’s expansion reflected a rare combination in the region: a strong balance sheet, insulation from sudden jumps in fuel prices due to its hedging strategy and a hub in Singapore that could...