Alan Levin

A recent spike in unruly passenger reports, many of them involving people refusing to cover their faces, prompted Homeland Security Secretary Alejandro Mayorkas on Tuesday to issue a stern warning to travelers.

Drones flown for a business purpose are prohibited in the United States. But that hasn't stopped an invasion of flights far beyond the policing ability of the Federal Aviation Administration, which since 2007 hasn't permitted commercial drones in the U.S. while it labors to write rules to allow them.

Airline pilots will get more realistic and expanded simulator training under the most significant revision to U.S. aviation-safety regulations in 25 years.

Government and airline reporting systems have logged dozens of cases in which passenger electronics were suspected of interfering with navigation, radios and other aviation equipment.