There is talk about introducing it in Canada. Just wondering how many countries do use it.
I know the US does, but the NTSB did make a safety recommendation it be restricted after an accident in Atlanta.
The FAA decided to not follow the recommendation;
The FAA ultimately decided not to implement the change, stating that doing so would increase workload, remove controller flexibility, and potentially compromise safety. On March 6, 1995, the Safety Board disagreed with the FAA’s analysis and classified the recommendation “Closed—Unacceptable Action.”