There is now a new Notice board feature.
Use it to keep your customers updated about such things as runway conditions, fuel test status and local weather. The notice board displays a complete list to office staff, but a filtered list to everyone else. Regular users only see notices they have been allowed access to, and do not see any expired notices.
If you would like to use the Notice board, you'll first need to check it's enabled under Admin > Notice board.
When writing an operational or safety message to your customers, you also have the option to pin it to the noticeboard.