The pilot is the only survivor after a domestic plane carrying 19 people skidded off the runway and crashed while attempting to take off in Nepal.
The plane was carrying two crew members and 17 technicians to the city of Pokhara for maintenance checks, airport security chief Arjun Chand Thakuri said.
Mr Thakuri also told local media the plane "caught fire" after it left the runway at Tribhuvan International Airport in the capital Kathmandu.
TV channels have shown the plane flying a little above the runway and then tilting before it crashed.
They also showed firefighters trying to put out the fire and thick black smoke rising into the sky.
The fire has now been brought under control as images show rescue workers rummaging through the charred wreckage of the plane.
Police official Basanta Rajauri said authorities have pulled out the bodies of all 18 people who died.
"Only the captain was rescued alive and is receiving treatment at a hospital," said Tej Bahadur Poudyal, the spokesman for Kathmandu's Tribhuvan International Airport.
The pilot was taken to Kathmandu Medical College Hospital with eye injuries but his condition is not life-threatening, said a doctor at the hospital who was not authorised to speak to media.
It is not yet clear what caused the crash.
It is monsoon rainy season in Kathmandu but it was not raining at the time of the crash. However, visibility was low across the capital.
The plane belonged to local Saurya Airlines, media said.
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Saurya operates domestic flights in Nepal with two Bombardier CRJ-200 regional jets, both around 20 years old, according to Flight Radar 24.
Tribhuvan International Airport, the main airport in Nepal for international and domestic flights, has been temporarily closed following the crash.
Nepal has been criticised for a poor air safety record, and nearly 350 people have died in plane or helicopter crashes in the Himalayan country since 2000.
The deadliest incident occurred in 1992, when a Pakistan International Airlines Airbus crashed into a hillside while approaching Kathmandu, killing 167 people.
Nepal's recent history of deadly air disasters
The Himalayan country has proved to be a dangerous place for air travel, with small airports set in remote hills and mountains shrouded in clouds.
Six people were killed in a helicopter crash in central Nepal. The chopper, which departed from Solukhunvhu district, home to Mount Everest and other high mountain peaks, had five Mexican nationals and one Nepali pilot on board.
A twin-engine ATR 72 aircraft carrying 72 people, operated by Nepal's Yeti Airlines, crashed in Pokhara, killing all on board. It was the worst air crash in the country since 1992 when all 167 people aboard a Pakistan International Airlines plane were killed when it ploughed into a hill as it tried to land in Kathmandu.
Sixteen Nepalis, four Indians and two Germans died on a De Havilland Canada DHC-6-300 Twin Otter aircraft that crashed 15 minutes after taking off from Pokhara, 125 km (80 miles) west of Kathmandu.
A helicopter crashed in bad weather in eastern Nepal, killing all seven people on board, including the tourism minister.
51 of 71 people on a Bangladeshi airliner operated by US-Bangla Airlines died when it crashed in cloudy weather as it came in to land at the Nepalese capital's hill-ringed airport.
A small plane crashed in bad weather, killing all 23 people on board. The Twin Otter aircraft, operated by Tara Air, was on a flight from Pokhara to Jomsom in western Nepal.
All 18 people on a small plane that crashed in bad weather were killed. The Twin Otter aircraft was operated by state-run Nepal Airlines Corp.
A small propeller-driven Dornier aircraft struck a bird and crashed shortly after takeoff from Kathmandu, killing 19 people, including seven British and five Chinese passengers.
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