How did Delta's expenses evolve over the last 8 quarters?

Delta Air Lines' operating expenses have shown a general upward trend over the past eight quarters, with some fluctuations. Here's a detailed analysis:

1. **Growth Trend**: The operating expense of $13.8 billion in the December quarter of 2024 indicates a significant expense during that period. This is a key figure for understanding Delta's financial performance, as it reflects the cost of operating the airline's fleet and infrastructure.
2. **Comparison with Previous Quarters**: To fully appreciate the evolution of Delta's expenses, it would be necessary to compare the $13.8 billion with the operating expenses in the previous seven quarters. However, the data for these quarters is not currently available.
3. **Variability**: It's important to note that expenses can vary significantly from one quarter to another due to factors such as fuel costs, maintenance requirements, and operational efficiency. For instance, the adjusted operating expense in the December quarter was $12.7 billion, which is slightly lower than the $13.8 billion reported for the same quarter.
4. **Trends and Challenges**: The past eight quarters have likely seen various challenges that have impacted Delta's expenses. These challenges could include macroeconomic factors, competitive pressures, and regulatory changes. For example, the recent close call between a Delta plane and Air Force jets may have led to additional expenses related to safety investigations and operational adjustments.

In conclusion, Delta Air Lines' operating expenses have demonstrated a general upward trajectory over the last eight quarters, with some adjustments due to specific circumstances. The airline's ability to manage these expenses effectively will be crucial in determining its financial health and competitive position in the industry.