Here’s the American Airlines route map from Life magazine in 1951:
This when airlines routes were still regulated, so the hub and spoke system is still 30 years away. I know they had flown coast to coast with 1 stop service by this time. So you can imagine something like New York City to Oklahoma City to San Francisco from this map. Probably took you about a day. Still pretty much does, door to door.
Then here’s an international route map from 1956:
I don't know anyone who flew across the Atlantic at this point in time. I know they still had to stop, so I imagine that was in the Azores. It shows England to Bermuda on here, but I wonder how often that was possible.