Replacement chain

Zappe Airlines is considering two alternative planes. Plane A has an expected life of 5 years, will cost $100 million, and will produce after-tax cash flows of $35 million per year. Plane B has a life of 10 years, will cost $138 million, and will produce after-tax cash flows of $30 million per year. Zappe plans to serve the route for 10 years. The company's WACC is 12%. If Zappe needs to purchase a new Plane A, the cost will be $110 million, but cash inflows will remain the same.

Should Zappe acquire Plane A or Plane B?