Uber's plan to trial an aerial taxi service in Melbourne is technologically feasible but needs to be well regulated to avoid "absolute chaos", according to a civil engineering expert.

Key points: The service would use a network of small and electric aircraft using vertical take-off and landing technology (VTOL)

The service would use a network of small and electric aircraft using vertical take-off and landing technology (VTOL) A 2016 paper proposed using car park roofs and existing helipads to run the service

A 2016 paper proposed using car park roofs and existing helipads to run the service The Civil Aviation Safety Authority said there was a long list of hurdles to be cleared by Uber

The global ridesharing giant's Uber Air pilot — which will also run in the US cities of Dallas and Los Angeles — aims to connect transport hubs like airports to central city sites.

The rideshare company said test flights were due to start from 2020 and plans were for commercial operations to begin from 2023.

Jake Whitehead, a University of Queensland researcher who specialises in transport, said the timeline was achievable from a technological perspective.

"We are very close to the point that battery technologies can support these kinds of smaller vehicles," Dr Whitehead said.

"What will be the challenge is the regulation.

"I'd hate to see us be in a position where it's a repeat of Uber ground vehicles where governments aren't adequately prepared for this technology, and aren't proactively working with these companies to look at how to make sure that we can benefit from this technology, and not end up in a situation where it's absolute chaos."

Dr Whitehead said Uber's "extremely aggressive" approach to entering new markets in the past should prompt governments to think carefully about what regulations are needed to preserve liveability.

"The reality is there are some downsides to this technology if it's a free-for-all and there are no rules in place."

Uber also plans to offer flights in the US cities of Los Angeles and Dallas. ( Supplied: Uber )

Uber flags expansion to other Australian cities

The announcement was made at Uber's Elevate summit in Washington after the deal was sealed with Melbourne Airport and companies Macquarie Capital, Scentre Group and Telstra.

"Australian governments have adopted a forward-looking approach to ridesharing and future transport technology," said Susan Anderson, regional general manager for Uber in Australia, New Zealand and North Asia.

"This, coupled with Melbourne's unique demographic and geospatial factors, and culture of innovation and technology, makes Melbourne the perfect third launch city for Uber Air.

"We will see other Australian cities following soon after."

The rideshare company has been a disruptor to traditional taxi services in Australia and is currently facing a class action lawsuit from taxi drivers.

Some Australian Uber drivers have protested over their pay and conditions, most recently joining a global protest in May.

Ms Anderson said Victoria's State Government had been "highly supportive" of the plans for the trial.

"Melbourne is one of the world's most liveable cities and importantly it's innovations like this that demonstrate that we're at the leading edge of new technologies," Treasurer Tim Pallas told the ABC.

The Civil Aviation Safety Authority (CASA) told ABC Radio Melbourne the authority would work with the company to ensure the service was safe before it started operating.

CASA spokesman Peter Gibson said the list of challenges for Uber was a long one:

The company would have to get a safety certification for the new battery-operated aircraft — which does not exist yet

The company would have to get a safety certification for the new battery-operated aircraft — which does not exist yet The airspace they would use would have to be managed by authorities

The airspace they would use would have to be managed by authorities The people operating the aircraft would need specialised training

The people operating the aircraft would need specialised training Infrastructure for the mini-airports does not yet exist

The regional general manager of Uber Eats, Jodie Auster, conceded the days of pilotless flight were a long way off.

"There's a lot of work to do. An urban ridesharing network in the sky does not happen overnight. It's going to take some time," she said.

Aerial ridesharing is being touted as a big part of future urban travel. ( Supplied: Uber )

Trial to move away from 'noisy, inefficient' helicopters

A 2016 Uber Elevate paper described a network of small and electric aircraft that can take off and land vertically known as VTOL (vertical take-off and landing).

It proposed using sites like car parks roofs and existing helipads to run the service.

"The closest equivalent technology in use today is the helicopter," the paper said.

"But helicopters are too noisy, inefficient, polluting and expensive for mass-scale use."

VTOLs would make use of "autonomy technology" to reduce the risk of operator error.

Uber is certainly not the only company racing to take over the skies.

Airbus is trialling its own air taxi service using a prototype electric aircraft, similar to a drone, which can take off and land vertically.

German company Volocopter is set to test its own drone-based vehicles in Singapore later this year.

Air New Zealand has also said it is examining an autonomous electric air taxi service.

It would not be the first time Uber has offered an air service in Melbourne.

Uber Chopper subsidised $1,000 one-way helicopter flights from Batman Park to Flemington Racecourse during last year's Melbourne Cup Carnival.