In the planner
Checklists & notes
Passports, deposits and meeting points, written down once and visible to the group.
One checklist per trip
Add the things that must happen before anyone flies, and tick them off.
Notes that stay with the trip
Keep the details nobody remembers out loud in the same place.
The group sees the same list
Everyone can check where things stand without asking.
Export and back up
Export the trip or back everything up whenever you like.