Delta is betting on flying-taxi rides to and from airports, announcing a $60 million investment in Joby Aviation Inc. JOBY -1.53%▼ and plans to offer service in New York and Los Angeles. Delta Air Lines Inc.’s DAL 0.10%▲ investment will give it a 2% stake in Joby, which also has been backed by Uber Technologies Inc. UBER -1.92%▼ and went public last year . Delta said its investment could grow up to $200 million if certain milestones in the development and delivery of the service are reached.