Example query (Berlin to Barcelona): https://farebox.airmail.rs/plan/52.5176122,13.4180261/41.380...
There are some bugs still. Notably, it's not capable of planning the return trip for this route, nor the reverse of the trip from Seattle to NYC that I gave in the blog post.
Blog post: https://blog.ellenhp.me/performant-intracontinental-transit-...
Repo: https://github.com/ellenhp/farebox
Side-note but in the past some have criticized my writing style and it's been a bit hurtful at times but if you have constructive feedback on the blog post I'd appreciate it. I'm trying to get better at writing. :)