The airline sector is trading lower after the release of September's Consumer Price Index (CPI) data, which revealed a 22.4% year-over-year increase in airfares. This surge in ticket prices is largely attributed to persistently high jet fuel costs, a factor that has recently led major carriers like Delta Air Lines to cut their profit outlooks. While travel demand remains robust, the market is focused on the impact of these significant cost pressures on airline profitability.