The airline sector, represented by the JETS ETF, experienced a significant after-hours rally, building on strong gains from the main session. This upward momentum is primarily attributed to a sharp decline in crude oil prices, which fell over 3% on signs of easing geopolitical tensions with Iran. Since jet fuel is one of the largest expenses for airlines, a sustained drop in oil prices directly improves their profitability margins, leading to broad-based buying across the sector.