WASHINGTON / AP So many people are registering drones and applying for drone pilot licenses that federal aviation officials said they are contemplating the possibility of millions of unmanned aircraft crowding the nation’s skies in the not-too-distant future. In the nine months since the Federal Aviation Administration created a drone registration system, more than 550,000 unmanned aircraft have been …

  Bloomberg A spare battery overheated and created smoke in the cabin of a Delta Air Lines Inc. flight. The plane, a Boeing Co. MD-88, continued to its destination without further problems. Flight 2557 from Norfolk, Virginia, to Atlanta, carrying 143 passengers and five crew members, had just taken off when flight attendants noticed the smoke in the rear section …

  Bloomberg Brazil is unlikely to join the initial phases of a proposed United Nations accord being brokered this month to limit emissions from international air travel, a senior government official said. Brazil, one of the fastest-growing aviation markets, doesn’t produce enough emissions to justify joining the accord in the initial voluntary phases, beginning in 2021, said Brazilian National Civil …