Aviation stocks are experiencing broad-based selling pressure. At the time of writing, CHINA EAST AIR (00670) was down 4.34% at HKD 4.19. AIR CHINA (00753) fell 4.14% to HKD 5.10. CHINA SOUTH AIR (01055) declined 3.39% to HKD 4.28. CATHAY PAC AIR (00293) dropped 0.79% to HKD 12.50. The decline is attributed to renewed geopolitical tensions between the US and Iran impacting oil prices. On the evening of May 10th, reports from Iran indicated the country had formally rejected a US proposal, viewing acceptance as capitulation to what it termed excessive demands from US President Trump. Trump subsequently responded on social media, calling Iran's response "totally unacceptable." International oil prices surged over 4% this morning, with Brent crude futures rising to around $105 per barrel. Analysts note that fuel costs constitute the largest expense for airlines, accounting for approximately 30% of total revenue for Chinese carriers. Sustained high oil prices significantly impact airline profitability.