Travel App Api is correct but App hangs

I re-formatted the JSON you posted by using the Preformatted text button (</>) in the forums toolbar. That removes the smart quotes. Now you can copy that entire wall of text and paste it into https://codebeautify.org/jsonviewer to view the JSON tree. If you click on a property name on the right side of the window, it will show the path to that property at the top. Like this:

If you need to know more about how to parse JSON, you can watch my tutorial video here: API JSON Tutorial (Video)