No you shouldn't expect that. Even the Earth is beginning to go radio-dark relative to 50 years ago as tight-beam radios take over from more broad-spectrum (and broadly directional) systems. We are also beginning to deploy fiber and laser networks to replace the old radio links and these won't be detectable at vast distances. Even when we deploy new broadband systems (like cell phone towers), they are much more limited in range than the old TV and radio broadcasts of old and wouldn't necessarily be detected from far away. And to your specific example of air traffic control, even now it's being supplemented (and may one day be replaced entirely) by shorter range transponders, data links and less visible systems like lidar (laser radar).
And all that's happening now with technology we have and understand. Trying to guess what exactly we'd see from more advanced societies and from societies that have a completely different technological framework is a losing game. We think that aliens would think and act like us on some level and that's just a fundamentally flawed assumption in my opinion. For one, just the environment they inhabit will force them down different technological paths. Our atmosphere and our solar radiation force us to use some radio bands and communications links over others, this would not necessarily be true of other species.
Plus, we tend to view our own very recent history as indicative of the way things have to be. When the first alien-hunting radio telescope arrays went up, practically no one considered that advanced societies might not be using the radio frequencies we were looking for in a way we might detect - even as our own technology was moving away from the very things we were looking for. This flawed reasoning has been acknowledged and now scientists are looking for deliberate laser bursts and other potential tell-tale signs of civilization even though there is still an enormous amount of inertia in old-fashioned radio searches.
And in the end, what we are doing ourselves right now is such a vanishingly small snapshot in time. Even if we accepted that all societies will go through a radio-heavy phase (which again, isn't a given), that phase will be exceedingly short if going by our own example. The odds that an advanced society will have gone through it in a window of time where we'd be able to detect it is stupifyingly small - and that's even putting aside the distances involved. If there are other societies on the other side of the galaxy who are broadcasting in a window when we could detect them, we still probably could not based on the distances involved and the amount of stuff between us blocking the signal.
