The aviation industry is betting millions of dollars air taxis will play a big role in the future of transportation.

Over the past few months, U.S. carrier United Airlines ordered 200 air taxis from Eve Air Mobility and another 100 from Archer Aviation. American Airlines had an agreement for 250 from Vertical Aerospace. Last year, Canadian helicopter operator Helijet inked a deal with Blade Air Mobility. The partnership gives Blade the rights to Helijet’s routes and infrastructure, and Helijet access to Blade’s air taxis.

Automakers are also showing interest in the eVTOL space, which has significant overlaps with electric vehicles. They are already pouring money into developing EV batteries. Hyundai, GM and Volkswagen are all working on developing their own air taxi prototypes. Automakers can offer air taxi-makers manufacturing expertise as well. Daimler has partnered with Volocopter, while Joby Aviation counts Toyota as a major investor.