ETA in Navigator
Estimated time arrival will be nice for guest and property too because they could now when they will be more bussy. Guests could easily choose ETA in online check-in process (or booking process too). The property will have information when a guest arrives in the hotel. This could be integrated within Commander as well - like a statistic, list of guest sorted by time etc.
Bob W. commented
That would work great for us as well - especially if the online check in arrival/departure times would automatically also update on the timeline accordingly. :)