And what they found was... nothing? This is a strange article, you keep thinking they are going to tell you something interesting. And then they don&#x27;t. For example, they have a map showing that helicopters took the same routes: it&#x27;s almost as if people are flying to and from the same airports and there&#x27;s some sort of plan in place for where they fly. Who knew?<p><i>Chartering a helicopter flight from Zürich to Davos can cost as much as $10,000. We built our helicopter-tracking rig for under $200.</i><p>Is that supposed to be some weird juxtaposition?<p>Almost feels like this entire article is a justification for them being able to expense the cost of building an ADS-B set up.