While Uber Elevate plans to launch an air taxi service for up to four passengers in 2023, a New York-startup is thinking bigger by developing a drone bus that fits 40 people. The drone 'bus' able to carry 40 people at a time will let New Yorkers fly to the Hamptons for just $85 - a fraction of the cost of a helicopter - but start-up creators say it won't be ready until 2024