Singapore Airlines (SIA), the world’s largest airline by market value, has posted its second straight quarterly loss with a second quarter net loss of S$159 million (US$114.6 million) compared with a net profit of S$324 million a year ago. This follows from a net loss of more than S$300 million in the first quarter of this financial year. SIA Cargo posted an operating loss of US$193 million with yields averaging just $0.20 per load tonne kilometer, down almost a third over the same period in the previous year.