What unlocks the Medium ATCT?

Can anyone tell me what unlocks the medium-size Air Traffic Control Tower? I’ve just played all through to setting up a Remote Stand in non-Sandbox mode and can’t buy a medium ATCT to increase my number of flights a day. The previous play-through I did I found I could buy this, but I can’t remember when it unlocked in that play-through.

I believe you need to unlock it via a projection the R&D section (which is under operations tab). Project is like “advanced terminal upgrade” or something like that idk, but basically gives you some more stuff and a medium ATC tower

It is indeed an R&D project. Having played in sand box mode myself, the R&D system really threw me off, it’s fun though. You actually have to have an airport administration area now.

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