@apuls, @davehart if you send me the IPs that were giving poor suggestions (and what you expected) in email or a DM I can figure out why it didn’t work.
The system gets location from the maxmind data and then I have a little service that makes a list of nearby airports from https://ourairports.com data. It’s trying to balance giving you big airports, but also suggest local ones if that makes more sense.
I don’t remember adding a feature for manually specifying the location code; so either that’s a bug or I forgot I did that. 