KEY POINTS:
Lightning punched a hole in the nose of a jet carrying nearly 300 passengers as it came into Auckland last week.
The Lan Chile Airbus was one of two South American planes struck as they landed in a huge electrical storm.
The passengers, flying from Sydney to Santiago
via Auckland, were left stranded overnight and the plane was grounded for two days while parts were flown in from South America.
One witness said the hole was the size of a dinner plate.
An Aerolineas Argentinas plane carrying a similar number of people was also damaged as New Zealand was pounded by almost 15,000 lightning strikes in 24 hours.
Neither airline wished to comment, but Auckland International Airport spokesman Richard Llewellyn confirmed both planes were damaged.
"There was quite a bit of lightning around them when they came in. The engineers checked them out once they landed, it was all fine."
Two Air New Zealand flights were also struck by lightning on Wednesday; one, a flight from Wellington to Auckland, hit as it was descending. Passengers on the Boeing 737 saw "a ball of light" to the left of the aircraft and heard a clap of thunder.
There was no obvious physical impact and passengers did not know that lightning had struck their aircraft until the captain told them when they had landed.
Air New Zealand spokeswoman Tracey Palmer said the lightning struck the aircraft's nose-mounted radome, which houses its weather radar antenna, but passengers were not at risk.
She said both planes were checked and there were no "airworthiness issues.
"All aircraft are fitted with static dischargers that dissipate the energy from any lightning strike back into the atmosphere."
Civil Aviation Authority spokesman Bill Sommer said lightning damage to aircraft was rare and most were built to handle the power surge.
The highest number of reports of lightning damage was 37, in 2002, but only two incidents had been reported this year.
Radar technology meant planes could often fly around thunderstorms, but pilots could sometimes do nothing about it, Sommer said.
"I've seen lightning damage to planes. It looks like someone has taken a spot-welder and put holes in the skin."
Since the exterior of most aircraft is metal, the electrical charge in the lightning bolt travels along the surface, causing only minor damage, such as pits or burns.
Occasionally, it can damage other parts of an aircraft, such as the electrical or avionics systems, but in rare cases it can cause the fuel tanks to explode.
Hail and turbulence causes much more damage to aircraft than lightning. MetService weather ambassador Bob McDavitt said New Zealand experienced almost 15,000 lightning strikes in the 24 hours to 9am on Thursday, mainly across the northern part of the North Island.
