Originally Posted by CONF iture
Usually une annonce is not a display but an announcement made through a public aural system.
An 'annonce' can be in writing, e.g. the small ads in a newspaper. Good point, nevertheless.
Found this in the "Lexique-bilingue" on the Dassault-Aviation website:
ANNONCIATEUR DE MODE DE VOL: FLIGHT MODE ANNONCIATOR (FMA)