Depending on the airline - in some airline I used to have one fleet category for each aircraft type. In other I had one fleet category for each hub. And additonal I had a category for aircraft I want to change something in the timetable…
Yeah, that’s what I do too when I have multiple hubs. With my current airline, I made the split by aircraft type and destination (although admittedly, splitting up between DH4 Europe and 737 Europe isn’t all that effective, since neither of those will operate on the intercontinental market).
I’m kinda hyper organized, but for me it just depends on the current size or expected size. Also I have even numbered flights going out-bound a hub and odd in-bound… further grouped into hub/destination/aircraft type.
Yeah, flightnumbers are also organized that way with me. Before planning, I create the routes, so my list of available flights is quite long (probably about 150 flights in it right now), but then I can be sure that flights are planned properly.