SINGAPORE-based air carrier Silk Air would raise fuel surcharges for tickets issued from Thursday, the firm stated on its website. “The adjustments will offer only partial relief of higher operating costs arising from increases in the price of jet fuel,” it stated. Silk Air will raise the charge from US$33 to $37 for business travellers, and $25 to $28 for economy class on its routes from Singapore to Southeast Asian cities. The airline connects Singapore with both Siem Reap and Phnom Penh airports.