Two air traffic controllers who failed to maintain the minimum distance between two aircraft over Ho Chi Minh City last month were fined VND7.5 million (US$351) each, aviation authorities said.
Nguyen Hoang Tin, 31, and Pham Ngoc Lam, 47, of the Ho Chi Minh City Area Control Center did not perform due process, which resulted in an incident that threatened aviation safety, according to inspectors of the Civil Aviation Authority of Vietnam (CAAV).
Tin will also get his license revoked in two months, the inspectors said.
The "breakdown of separation" incident happened on December 19 when Tin and Lam allowed a Cathay Pacific Cargo airplane and a Vietnam Airlines passenger airplane fly too closely over HCMC, which increased the risk of a collision.
Air traffic controllers work in an airport in Hanoi.
Aircraft breach separation rules when they fly within five nautical miles of each other on a horizontal axis, or within 1000 feet vertically.
According to CAAV, the number of aviation incidents in 2014 doubled from 2013 to 71 incidents.
Three of the 71 incidents were serious, it said.
The most notorious incident was a 35-minute power outage at the control tower of Tan Son Nhat Airport in HCMC.