Flying taxis, once the purview of science-fiction films such as The Fifth Element, might soon be a staple of urban transport, like better batteries and innovative designs make it cheaper, cleaner, and quieter to travel short distances by air. Citigroup thinks sales of air taxis could reach $5 billion a year by the end of the next decade.

Two companies came to Singapore this week to share their vision during the Intelligent Transport Systems World Congress. U.K.-based Skyports Ltd. built a model flying taxi station, while Germany’s Volocopter GmbH gave a demonstration flight of its electric vehicle.

Engineers from the two companies walked reporters through how it might work. A traveller opens an app and chooses among a handful of stations in a given city flying between the posh Marina Bay Sands hotel, and the luxury resort island of Sentosa was one option this week. The traveller picks the departure time and gets a confirmation showing who the pilot will be.

When travellers show up at the station, a biometric scanner uses facial recognition software to confirm the booking and weighs them to make sure the vehicle will remain balanced in the air. Passengers then slip into be whisked across the sky to their destination. When they land, workers will slip a new battery into the back of the taxi to ready it for the next passage.

Of course, that’s still off in the future, and the present offers challenges. The companies are trying to win over regulator support and public acceptance, which is where this weeks demonstration comes into play.

The station, called the Voloport, was sleek and futuristic. Video screens showed how much time you’d save in flying taxis vs. the wheeled kind. (A four-minute ride to Sentosa, compared with 21 minutes on the ground.) An engineer explained that when the stations are operational, helipads could be hydraulically raised and lowered between the roof and ground floor of the station to make boarding and taking off more seamless.

The Volocopter itself looks like a toy come to life. Instead of one giant rotor in the middle, it has more than a dozen smaller ones arrayed above its cab. The demonstration models were relatively small; there was room for just two people to sit very snugly, side-by-side.

One of the supposed benefits of electric aircraft such as the Volocopter over petroleum-powered helicopters is the noise or lack of it. Electric motors are thought to be less likely of a nuisance to people living near stations, but it was hard to tell exactly how quiet the aircraft was; the demonstration flight never got closer than a few hundred meters to a throng of media members. From that distance, it sounded like a slightly larger-than-normal bumblebee.

While airborne rides might not be for everyone, Volocopter Chief Executive Officer Florian Reuter says the company plans to use software and the relative freedom of air routes to be able to design slower, gentler rides for passengers who need it. There could be a grandma mode and a rocket-man mode, he quips.

The cost will be a further issue. Skyports Managing Director Duncan Walker says initial routes might cater to curious tourists and wealthy business travellers, but the companies hope to bring down costs enough to make it a mass-market product. Citi estimates the eventual cost of a ride at about $3.75 per mile cheaper than a limousine but still double the cost of ground-based ride-hailing.

Citi expects designers to keep tweaking the technology and working with regulators so they can start to offer regular air taxi services from 2025. This could come even sooner: Uber Technologies Inc. is targeting launches in Los Angeles, Dallas, and Melbourne as early as 2023. In a report last month, Citi said up to 20,000 electric passenger aircraft could be sold annually by 2030.

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