Fuel Price Volatility: Significant fluctuations in jet fuel prices can directly impact operating costs and profit margins, as fuel is one of Southwest's largest expenses, making financial planning challenging.

Labor Relations and Staffing Challenges: Disputes with unions, pilot shortages, and difficulties in attracting and retaining qualified personnel can lead to operational disruptions, increased labor costs, and service reliability issues.

Aging Fleet and Maintenance Costs: While maintaining a single aircraft type (Boeing 737) offers efficiencies, the aging of parts of its fleet requires ongoing significant investment in maintenance, potentially leading to unexpected groundings or increased capital expenditures.