Consider the following airline industry data from mid$-2009$:

a$)$ Use the estimates in the table in the previous question to estimate the debt beta for each

firm $($use an average if multiple ratings are listed$).$

b$)$ Estimate the asset $($unlevered$)$ beta for each firm.

c$)$ What is the average asset $($unlevered$)$ beta for the airline industry, based on these firms?