Now that the NEA/BCL 102 have started to become available, one interesting fact was that the Armalite 102 was used by KLM when the first trans polar flights where started over the arctic using DC7's. If you read the history section of KLM it refers to this. i.e when your grandparents might have traken such a flight! 
http://dictionnaire.sensagent.leparisien.fr/KLM%20Cargo/en-en/
http://dictionnaire.sensagent.leparisien.fr/KLM%20Cargo/en-en/


















































