Swiss investigators have opened an inquiry after a proximity incident on the ground involving two Airbus A320s conducting take-off at Zurich.

Only scant details have been disclosed about the incident by the Swiss investigation agency BFU.

But it states that the event, which occurred on 15 March, centred on two Swiss International Air Lines flights bound for Moscow Domodedovo and Madrid.

The BFU simply says that there was a "close encounter between two simultaneously departing aircraft on crossing runways".

Zurich has three runways: the two longer ones - designated 14/32 and 16/34 - are separate, but converging, while the latter intersects with the shorter runway 10/28.

The investigators have not identified the runway directions involved, although meteorological data at the time indicates winds from the north, as well as good visibility.

There is no immediate information on the circumstances of the incident or the proximity of the two A320s at the time, nor detail on any mitigating actions by the crews or air traffic control.

Swiss International Air Lines' schedule shows that flights LX1326 to Moscow and LX2026 to Madrid have the same scheduled departure time of 12:25. The incident occurred at 12:43, according to the BFU.

Source: Air Transport Intelligence news