Traduction de «whom he had celebrated his ninety-ninth » (Anglais → Français) :

The sole occupant in the plane, he was returning home from visiting his father, Mr. David Rockefeller, with whom he had celebrated his ninety-ninth birthday.
Seul à bord de l'avion, il revenait chez lui après avoir rendu visite à son père, M. David Rockefeller, qui fêtait ses 99 ans.