Whisper Aero emerges from stealth to quiet drones and air taxis The skies are on the cusp of getting busier — and louder — as drone delivery and electric vertical take-off and landing passenger aircraft startups move from moonshot to commercialization. One former NASA engineer and ex-director of Uber’s air taxi division is developing tech to ensure that more air traffic doesn’t equal more noise. Mark Moore, who was most recently director of engineering at Uber Elevate until its acquisition by Joby Aviation, has a launched his own company called Whisper Aero. The startup, which came out of stealth this week, is aiming to designing an electric thruster it says will blend noise emitted from delivery drones and eVTOLs alike into background levels, making them nearly imperceptible to the human ear.