You can tell that the software is created by people passionate about aviation (and also passionate about nice UX, something that most all of the Logten competitors really lack). Do you remember if my guess about using NSDate internally was correct?
Honestly, I don't remember Re: NSDate. It was many jobs and Dante's levels of burnout ago. :-)
What I remember from that time was a lot of fighting with Apple's early iCloud syncing. Because it had a habit of being incredibly fraught and flakey using SQLite-backed Core Data stuff.