[proteal]

It has to do with how ATC needs to be able to communicate with all planes in the air, even ones built 100 years ago. They have to use radio so everyone can hear everyone else. There’s no other technology that is as ubiquitous as radio, so they have to work with what they’ve got. Upgrading to other stuff would be an absolute nightmare, though they are making progress on less critical fronts.

[mmooss]

Couldn't comms broadcast in multiple parallel modes, like cell phone traffic?: More clear (probably digital) transmissions in on band, and for backward compatibility, old radio transmissions in another.

[gosub100]

I think one of the best things they could add would be an electronic drawing tablet for ATC to draw a flight path on a map and pipe it directly into the pilots EFIS or HUD. It's not fool-proof, but in high density airspace, it seems more efficient to be able to draw a curve and press a button than try to verbally describe it. Of course one major pitfall is you cannot draw in 3D.

[db48x]

That would be slower and ironically less precise than what we already have, which is navigation by named waypoints.

[bigbuppo]

They already have something better than that. It's called a published departure procedure that pilots are supposed to follow. In this case, one of the pilots failed to follow the published departure procedure and came close to being on the next season of Mayday: Air Disaster.