Engineers sent China's biggest-yet cargo drone on a test run over the weekend while a helicopter taxi took to the skies on a soon-to-open 100-km route to Shanghai, laying new milestones for the country's expanding low-altitude economy.

Packing a payload capacity of 2 metric tons, the twin-engine aircraft took off on Sunday on an inaugural flight, state media said, citing developer Sichuan Tengden Sci-tech Innovation Co., for a trip of about 20 minutes in southwestern Sichuan province.

China's civilian drone makers are testing larger payloads as the government pushes to build a low-altitude economy, with the country’s aviation regulator envisioning a $279-billion industry by 2030, for a four-fold expansion from 2023.

The Tengden-built drone, with a wingspan of 16.1 meters and a height of 4.6 meters, is slightly larger than the world's most popular light aircraft, the four-seat Cessna 172.

The trial run followed the maiden flight in June of a cargo drone developed by state-owned Aviation Industry Corp of China (AVIC), the leading aerospace enterprise.

The AVIC's HH-100 has a payload capacity of 700 kilograms and a flight radius of 520 km. Next year, AVIC plans to test its biggest cargo drone, the TP2000, which can carry up to 2 tons of cargo and fly four times farther than the HH-100.

China has already begun commercial deliveries by drone.

In May, cargo drone firm Phoenix Wings, part of delivery giant SF Express, started delivering fresh fruit from the island province of Hainan to southern Guangdong, using Fengzhou-90 drones developed by SF, a unit of S.F. Holding 002352.SZ.

Cargo drones promise shorter delivery times and lower transport costs, Chinese industry insiders say, while widening deliveries to sites lacking conventional aviation facilities, such as rooftop spaces in heavily built-up cities.

They could also ferry people on taxi services.