Large Transport
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (mon) 6
Communication Breakdown; Distraction; Situational Awareness; Time Pressure
ATC Issue All Types; Airspace Violation All Types; Conflict Airborne Conflict; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Procedure; Human Factors
I was departing runway 22L. It was coordinated that I owned the west departures (MYKIE fix in this event) and that 3LC (28R controller) would coordinate a one time MYKIE departure (Aircraft X) when that aircraft was ready and number one at the runway. Due to reroutes and a tailwind situation; Aircraft X wasn't ready for an extended period of time after this coordination. The 3 Local Controller (LC) then departed Aircraft X on a 270 without coordinating as I departed Aircraft Y on the same heading. The two departures ended up side by side 2 miles away from the airport with less than standard separation.Memory joggers or some way of reminding the 3LC controller to coordinate the departure would have helped in this scenario from the 28R controller's perspective. From my end; I had kept an eye on the 28R departure line so that I would know when their MYKIE departure would be ready.  Unfortunately; due to an extended period of time and heavier than normal workload; I forgot about their departure when I rolled my westbound. A memory jogger would have also been helpful on my end; especially considering the increased complexity of the scenario. This is a scenario that does happen with reasonable frequency at O'Hare.
ORD Tower Controller reports of having a loss of separation due to an extended time period passing before the aircraft was airborne. Controller approved a departure that would enter his airspace; but the aircraft was not ready. Time period passed and Controller let one of his departures go around the same time the other approved departure went airborne. Separation was lost due to both aircraft being on the same heading and close proximity.