SINGAPORE: Singapore Airlines (SIA) reported a record annual net profit on Thursday (May 15), largely buoyed by a one-off gain recognised from the merger of Air India and Vistara, even as heightened competition pressured passenger yields. The carrier said net profit came in at S$2.78 billion (US$2.14 billion) for the year ended Mar 31, compared with S$2.68 billion a year earlier . The carrier recognised a one-off gain of about S$1.10 billion after completing the merger of its 49 per cent-owned