Uber is one step closer to getting its fleet of flying cars off the ground. Last year, Uber unveiled its future plan for flying taxis. Now, the ride-hailing company's aviation program Uber-Air is teaming up with the University of Texas and the U.S. Army Research Laboratory to make that a reality. The team will design new rotor technology that's needed to help the vehicles take flight with cruising altitudes of 1,000 to 2,000 feet and speeds up to 200 miles-per-hour. The collaboration is expected to take about 18 months. Uber says testing will follow shortly afterwards in Dallas and Los Angeles and riders could potentially use the service by 2023. However, the project still faces regulatory issues and other logistical obstacles as it progresses.