[Zhenya]

Using their UI, I can't seem to find the "interesting aircraft" tag. Here's what I see:

  * No data
  * No ADS-B Emitter Category Information
  * Light (<15500 lbs)
  * Small (15500 to 75000 lbs)
  * Large (75500 to 300000 lbs)
  * High Vortex Large (aircraft such as B-757
  * Heavy (> 300000 lbs)
  * High Performance (> 5g acceleration and 400 kts)
  * Rotorcraft
  * Glider / sailplane
  * Lighter-than-air
  * Parachutist / Skydiver
  * Ultralight / hang-glider / paraglider
  * Reserved
  * Unmanned Aerial Vehicle
  * Space / Trans-atmospheric vehicle
  * Surface Vehicle – Emergency Vehicle
  * Surface Vehicle – Service Vehicle
  * Point Obstacle (includes tethered balloons)
  * Cluster Obstacle
  * Line Obstacle

[Rebelgecko]

Yeah that was actually with adsbexchange (https://www.adsbexchange.com/currently-airborne-interesting-...).

[Tepix]

That's really interesting, there are two Project Balloons high over the Brasilian Amazon.