Seventeen companies have signed Space Act Agreements with NASA to participate in the agency’s first Urban Air Mobility Grand Challenge, a series of technology demonstrations meant to test the readiness of vehicles and systems intended for use in low-altitude, urban airspace.

Joby Aviation was the only company selected to provide a vehicle to fly in the initial event, termed the Grand Challenge Developmental Test (GC-DT) by NASA, set to take place later this year. GC-DT is meant as a preparatory event for the first official Grand Challenge (GC-1) event, slated for fiscal year 2022.

Five other companies — Bell, Boeing, NFT, Prodentity and Zeva — were selected to participate in the “vehicle provider information exchange,” providing the agency with information about their aircraft with the intent of participating in GC-1.