The Engines That Started It All: CF6-6 Makes Final Flight Along with the retirement of FedEx MD DC-10-10F aircraft in June comes the retirement of GE’s last CF6-6 engines, which reached nearly 50 years in service. Tags 50th anniversary Cargo CF6 CF6 engine CF6-6 engine dc-10 DC-10-10F Freighter retirement Read more about The Engines That Started It All: CF6-6 Makes Final Flight