At transit app, we built a domain specific compression for transit schedules. So instead of a city like New York taking 100mb, it takes like 5mb or so. This was

At transit app, we built a domain specific compression for transit schedules. So instead of a city like New York taking 100mb, it takes like 5mb or so. This was a couple years back when data was still more expensive, so one of the things it allowed is simply always downloading schedules for offline availability, instead of having to ask the user when and what to download. Here's a write up (sorry for the cheery tone) with some details https://blog.transitapp.com/how-we-shrank-our-trip-planner-till-it-didnt-need-data-84984ca56663/ https://blog.transitapp.com/how-we-shrank-our-trip-planner-t...