The airline sector is seeing a significant pre-market decline driven by rising geopolitical tensions between the U.S. and Iran impacting the Strait of Hormuz. This has pushed oil prices higher, leading to increased jet fuel cost concerns and worries about airline profitability. Adding to the negative sentiment, an analyst from Seaport Global Securities recently downgraded JetBlue, citing the airline's balance sheet risk in a high-cost fuel environment exacerbated by the conflict.