Yes, commercial flight goes back before the 60s. And sure there were the flying boats and so on. But that era of commercial flight was very limited, it was expensive, there were very limited schedules and so on.
Today I can get a flight to pretty much anywhere in the world, with maybe a day's lead time, and perhaps 36 hours of travel. Anywhere. In the world.
So, I think we can say air travel is no longer in "startup" phase. It is heavily regulated and very organised. (there are still startups in aviation, but they need a hook different to flying-you-there)
In the same way computers existed before 1960,and PCs were available in the 70's,but arguably its not till Windows 95 that it goes "main stream", and its not until the iPhone/Android era that "everyone has a computing device".
So my point is that the era of commercial aviation aimed at the masses kicks off in the 60s,not that the 60s is the first instance of commercial aviation.