As far as the ISP Omaha helicopter, I've heard it only a few times before the last few years on Ispern, during an ISP related chase or incident. It could be ICE, or the Army National Guard. They called into Kane Sheriff freq as "Omaha helicopter is in the air now monitoring traffic on this frequency." For metro Chicago, I believe CPD has their own helicopter to use, I've heard them up on Citywide 1 a few times in incidents. But I have not heard from ISP Air One in a long time, so it is not being used.
Aurora is still on OpenSky, so you can't hear them. And not compatible with Starcom. Brilliant plan. Every agency needs to at least hear the "Command" frequency/system/talkgroup in a crisis so we don't have a "radio crisis" too. They (ISP) even tried to use an ITTF talkgroup, only to be told that "This talkgroup has traffic on it, please find another talkgroup." Starcom has plenty of talkgroups! They need to work out a plan for these events, reserve some "Critical Talkgroups" in every Starcom radio for this. Many have little or no use. They conduct Mabas tests monthly with all the agencies radios, well, hey here's an idea. Add in the regional ISPs, DHS, ICE, etc too, so we don't repeat this.