It is now possible to insert multiple airport 'Notes' with different timeframes.
Click on the green 'ADD NOTE' button to add an extra 'Note' section
Once all the Notes are added, they will display the information within specified dates when you hover the mouse over the airport code.
See below example for the notes with different expiry dates (according to screen on the right):
If the checkbox 'Show on Calendar' is marked, the information will appear in OPS > Calendar section (yellow bar).