Skyrocketing fuel prices are starting to impact air travel in Southeast Asia with low-cost carriers particularly vulnerable, writes aviation analyst Brendan Sobie. SINGAPORE: Jet fuel prices have doubled since the start of the Iran war, leaving low-cost carriers particularly vulnerable. Domestic and regional air travel in Southeast Asia has boomed in the last two and a half decades, driven primarily by fast-expanding budget airlines and declining airfares. However, the low fares fueling this