[dadadad100]

Take a fly on an airliner in MS flight simulator sometime or watch any of the YouTubers that show this stuff. CitationMax is a good one. The screens tell the flight plan, altitudes, traffic, weather, terrain and more. The audio part is, as mentioned above, extremely efficient and shared. The audio is used for clearances from one step to another ( very loosely speaking) This improves everyone’s situational awareness. This may have been an issue at DCA where the commercial flight was on VHF and the chopper was on UHF.

If a plane loses comms there are well defined procedures and everyone knows exactly what that plane will do as they proceed to their destination.