Another calls for "little or no debt," which might translate to companies with a debt-to-equity ratio of less than 30 percent.
Its debt-to-equity ratio will rise to 55 percent, from 50 percent.
"If a company comes out and doubles its debt-to-equity ratio, you would say the risk is greater," the manager said.
However when it stalled, debt-to-equity ratios became a huge problem.
He said Delta's debt-to-equity ratio had more than doubled since 1988.
That leaves it with a debt-to-equity ratio of about 33 percent, significantly lower than many large real estate companies.
When looking for money, you must consider your company's debt-to-equity ratio.
"That's pretty dramatic, since they reduced their debt-to-equity ratio from 66 percent to 40."
Since none of the major rent-a-car companies is public, actual numbers are not available on debt-to-equity ratios.
One answer might be its debt-to-equity ratio, which stands at 2.5 to 1.