Please bear in mind that both the interviewers have 'day jobs', and certainly in the ATCO's case, and possibly the HR interviewer's also, they work shifts. It would be completely out of the question to attempt to contact you outside of office hours, and ATCOs only have a limited period of time during those hours at work; for most of those we'll all be wearing headsets. Also, one or the other might be on days off, or on leave, and in my experience whichever of the two is going to give feedback will contact the other interviewer to discuss things before talking to you, to ensure everything is covered.
Things will have been set in motion by your request, I assure you. Please be patient.