Nearly four years ago, I wrote a post about a software project Tim Sherratt and I were working on for Heritage of the Air called hota-time. Briefly, the idea was that hota-time would extract and then plot travel times between London and Sydney mentioned in Trove Newspaper headlines, as a quantitative way to gauge the qualitative impact that aviation had on Australian perceptions of distance -- or, to be more precise, travel time. We (Tim) wrote the code, proved the concept to our satisfaction, uploaded the project, and then didn't get around to writing it up for publication. Which we are now remedying… nearly four years later! (The writing, that is, not yet the publication.)
As part of this process, we've been cleaning up the data and trying some different visualisations. Here's one of the more interesting plots.

This is an updated version of the first plot in the old post, but instead of just lumping all the data together, it is separated out by colour:
- dark red: sea, present
- indigo: sea, future
- yellow: air, present
- teal: air, future
That is, present travel times are those reported as actually having been achieved, whereas future travel times have not yet been achieved (usually because they are medium or long-term forecasts, but shorter-term schedule changes fall into this category too). So dark red + yellow tracks actual travel times between London and Sydney, while indigo + teal tracks predicted travel times. Or dark red + indigo tracks sea travel, while yellow + teal tracks air travel.
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