• Delta Air Lines average return on investment for 2023 was 12.12, a 424.68% increase from 2022.
• Delta Air Lines average return on investment for 2022 was 2.31, a 113.85% increase from 2021.
• Delta Air Lines average return on investment for 2021 was -16.68, a 15.97% decline from 2020.

Roi - return on investment can be defined as an indicator of how profitable a company is relative to its assets invested by shareholders and long-term bond holders. Calculated by dividing a company's operating earnings by its long-term debt and shareholders equity.