Answer:
1950
Step-by-step explanation:
Automobile mass production started at 1920s, however cars makers had to face challenges that made the access to cars more difficult such as the Great Depression after World War I. On the other hand, airplanes were more a military technology for more decades while other improvments were discovered to make air travel more efficient . it was only during the 1950s with companies like Boeing in play when technology and industry were ready to make air travel a popular service in conjuntion with an already recovered car industry.