(EnergyAsia, May 22, Friday) — China Aviation Oil (Singapore) Corp Ltd (CAO) said its net profit plunged 54.6% to US$4.11 million for the quarter ended March 31, 2009, compared with US$9.045 million from year ago, due largely to losses at its associated company, Shanghai Pudong International Airport Aviation Fuel Supply Company Ltd (SPIA). CAO said…