This from Josh Boyajian:

Four 2023 E-One Cyclone pumpers have been delivered to the City of Chicago for:
  • Engine Co. 54 – FDD691
  • Engine Co. 75 – FDD692
  • Engine Co. 108 – FDD693
  • Engine Co. 22 – FDD694
There is a 5th engine that is not assigned yet.
 
There are numerous rear-mount aerials in the process of getting delivered to Fire Service, Inc. at the time of this writing. I believe 5 total.