Dubai again is planning for the takeoff of flying taxis in this futuristic city-state on the Arabian Peninsula, offering its firmest details yet Monday for a pledged launch by 2026.

Since 2017, the commercial capital of the United Arab Emirates has offered promises to launch flying taxis in the city already home to the world’s tallest building and other architectural wonders. A series of different types and companies have cycled through those promises as well, most timed to be included at Dubai’s annual World Government Summit, which saw this year’s edition begin Monday.

Dubai’s ruler, Sheikh Mohammed bin Rashid Al Maktoum, announced the relaunched flying taxi program on Twitter Sunday. This time, Dubai highlighted the six-rotor electric flying taxi made by Joby Aviation of Santa Cruz, California, in the promotional video.

The inclusion of Joby Aviation, rather than the Chinese-made EHang 184 and XPeng X2 or the German-made electric Volocopter all previously displayed in Dubai, wasn’t explained by Emirati officials. Joby aircraft featured at a stand at the World Government Summit on Monday.

Ahmed Bahrozyan, an official in the emirate’s Roads and Transport Authority, similarly told the state-owned Dubai Eye radio station on Monday that “it’s early days” for the plan.

Another difference in this year’s promise on flying taxis is the release of specifics about the program. The city plans four “vertiports” by Dubai International Airport, the world’s busiest for international travel, downtown Dubai, the manmade Palm Jumeirah archipelago and Dubai Marina. Those points will include two launching pads and four charging points for the flying taxis.