Another development in the case, it appears that all three officers were indeed from the Chicago Department of Aviation, not the Chicago Police Department as some earlier reports said:
2 more officers placed on leave after passenger dragged off United flight
By Jessica D'Onofrio
Updated 12 mins ago
CHICAGO (WLS) --
The Chicago Department of Aviation says two more officers have been placed on administrative leave after a Kentucky doctor was dragged off a United flight Sunday.
One officer was placed on leave Monday, one day after the incident. CDA said it will not release the names of the officers.
2 more officers placed on leave after passenger dragged off United flight | abc7chicago.com