Landing two planes just metres apart in perfect synchronisation is a manoeuvre more commonly performed by professional aviation stunt teams.
But travellers on a commercial flight were left stunned when they looked out of their windows to see another passenger plane about to hit the runway just metres away from their own aircraft.
The footage, which was captured by a passenger, shows the two planes emerge from a cloud simultaneously as they head towards San Francisco International Airport.
Touching down at exactly the same second, the two planes manage an almost perfect smooth landing.
The spectacular manoeuvre, known as a closely spaced parallel operation (CSPO), has been used at the San Francisco since 2013 and is designed to increase airspace capacity.
If more planes are able to touch down at the same time, it increases runway 'throughput' , according to the US Federal Aviation Administration.
Runways in San Francisco are separated by just 750 feet.
Airports in Sydney and Atlanta also use this manoeuvre to increase the number of planes coming into land at one time.
Other new developments in aviation include nuclear-powered planes which could see passengers change flight in mid-air and allow jets to refuel in the sky.