does mission planner track helicopters ?
i have setup web server at home Melbourne Australia 112.141.254.37:8079
and raw server for mission planner server IP 112.141.254.37 port 8078
ADS-B has nothing to do with aircraft type. As long as the aircraft has a beacon, it will show up inside the ADS-B. Most heli do have one to my knowledge, well in the USA for sure.
I am assuming you are using U Avionics ADS-B or Cube with a built in one.
I can see one plane flying 
Nice setup buddy!
i setup because i had an issue with helicopter i did not see or hear till was almost on top of my plane fly over my my property at 50m above the ground looking at Wedge-tailed eagle nest in the trees
using raspberry pi zero
i do have 3 Orange cubes one is missing in action ( in a tree in the bush ) after midair reboot one has random reboots on the ground and i keep getting hardware malfunction when i try to plug it in to a pc or laptop
theirs not a lot plane flying in Melbourne compare to 8 weeks ago 50 to 60 at one time now only 3 to 4 because of COVID-19 lockdown
Call the local airport and ask them what the Australian regulations are. In the US under FAA regulations, some crafts are not required to have ADS-B depending upon flying altitude. It’s going to become mandatory very soon including drones.
may be Aussies are behind in this.
It appears a lot of Cubes are experiencing IMU 3 failures. Accelerometer Calibration Fail
read this document. https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/phak/media/17_phak_ch15.pdf
What is your Flight Aware setup or how u did it. I might be interested in duplicating your setup for Chicago.
using raspberry pi zero and a
FlightAware Pro Stick USB ADS-B
bugger that’s the first i heard of it cost me 2k air frame now i have grounded all my orange cubes
Well maybe above are just one off cases. Contact the manufacturer get some support.
For raspberry pi, you wrote the code? sorry not familiar with FlightAware