Most of the date ranges are Sep 16 - Oct 8, which should give 3 weeks of data including for the Day of Week charts, but for analyses involving ETA the range starts on Sep 22 because it wasn't tracked until a bit later. But we wanted to be explicit about exactly which dates we're using for each chart.

We plan to keep tracking these trends as data rolls in and keep the community updated.

And that's right, we're just using the Google Visualization API: https://developers.google.com/chart/interactive/docs/gallery