(EnergyAsia, March 3) — China Aviation Oil Singapore Corporation Ltd (CAO) said it returned to profitability last year after suffering huge losses related to trading oil derivatives. Its net profits for the year to December 31 2005 were S$12.67 million, compared with losses of S$864.96 million the year before. (US$1=S$1.6).             Gu Yanfei, head of…