Our FC is running a ship with all bronco parts except for the rank 2 hull. We're currently rank 17 and just discovered sector 11 with a silver icon on the map. This might suggest that it's more related to proximity and not stat related. Something else I noticed is that when setting up routes with the airship sometimes if I pick some high level sectors or too many locations it changes the color of the trip information and stars in the upper right hand corner of the menu. Perhaps because our ship component stats are so low this is an indication that the trip might not go so well? Has anyone else noticed this having an effect on the rating of the trip being taken?