A very useful option for partnerships and small-to-medium clubs would be to use separate colors to represent members on the schedule overview, instead of using colors to represent the number of hours the aircraft is booked. Each member would have a unique color and a glance at the overview can tell you who has the aircraft on what days. Days when the aircraft is booked by more than use member would have multiple colors in the date square. I see this as a selectable option since it would get unwieldy for flight schools and larger clubs.