I recently took a flight with Noodler's Boston Safety Pen (my first time flying with a fountain pen). As I understand it, it's impossible for the change in air pressure to cause this pen to leak because of how it's designed.
In a decentralised social media it makes sense to host yourself. That's what we decided to do. This instance is run by two nerds, mostly for the why not of it. Feel free to join, and we'll hit you up with an "Hi, who are you?".