At least two persons were killed and five others injured on Sunday after a Summit Air plane collided with a chopper at the Tenzing-Hillary airport in Nepal's Lukla, according to news agency ANI.
Police spokesman Uttam Raj Subedi said: "The co-pilot and a policeman died at the crash site".
Both airlines are private companies serving locals and tourists in the remote areas of Nepal.
A co-pilot of the turbo-prop Let-410 plane run by Summit Air bound for Kathmandu and a police officer on the ground were killed on the spot, Lukla airport official Ema Nath Adhikari told AFP. He said the plane skidded off the runaway, hitting the helicopter of Manang Air. The pilot and three other crew members survived and are being treated at a hospital in Kathmandu after being airlifted there.
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A civil administrator, Narendra Kumar Rana, said the four passengers and a flight attendant on the plane were safe.
Lukla airport is the nearest airport to Mount Everest, while April-May is the peak climbing season in the Himalayan country.
The plane, operated by Summit Air, was not carrying passengers as it was trying to leave what is considered to be one of the world's most risky airports due to the shortness of its runway and its location surrounded by mountains. It's open only to helicopters and small fixed-wing aircraft.
In February a helicopter carrying seven people including the country's tourism minister crashed in bad weather in eastern Nepal, killing seven all on board.