China Southern A319 at Guangzhou on Jul 30th 2014, smoke in cockpit

A China Southern Airlines Airbus A319-100, flight CS-6059 from Guangzhou (China) to Phnom Penh (Cambodia), was climbing through 5000 feet out of Guangzhou when the crew donned their oxygen masks, declared emergency reporting smoke in the cockpit and returned to Guangzhou for a safe landing about 19 minutes after departure.

Passengers reported there was a burning electrical smell.

The airline confirmed a mechanical problem.

A replacement aircraft reached Phnom Penh with a delay of 4 hours.