There is one museum in the UK in which there are 3 jets that I have flown in service, that is individual airframes, not types, and that makes you feel old! I have flown the last trip of one type which was a display (30 years after the type's first flight), and the last trip of the first airframe built of another type (44 years after the first flight). Both of those events actually gave me a great sense of pride. However, I have also landed in one aircraft which the owner then refuelled and took off. 15 minutes later he had a catastrophic engine failure and died in the subsequent forced landing attempt. That made me think about my own mortality and how I would have handled the forced landing differently and, hopefully, survived it. I was very sad to lose a friend but I have lost (too many) others in aircraft accidents and the circumstances of this made no difference to me; it was the loss of a friend that mattered most.