In a speech today, Secretary of Homeland Security John Kelly said that airlines that don't get on board with new security procedures could see electronic devices banned on their airplanes—or be barred from flying in the US altogether.

The Department of Homeland Security today said it will be demanding "enhanced security measures" for all commercial flights going into the US. The specific measures, which will be both "seen and unseen," aren't specified in a DHS fact sheet , but they generally include enhanced passenger screening, "heightened screening of personal electronic devices," and "deploying advanced technology, expanding canine screening, and establishing additional pre-clearance locations."

The new measures will affect 105 countries hosting approximately 280 airports, 180 airlines, and about 2,100 daily flights carrying 325,000 US-bound passengers.

DHS already has in place a policy that bars electronic devices larger than a cell phone from Turkey and several Middle Eastern airports. The UK has a similar policy, affecting airports in six countries.

A wider laptop ban that would affect European airports was also discussed, but that idea was shelved in May without an agreement.

"[W]e have continued to be confronted by threats to passenger aircraft," said Secretary Kelly at a security conference today. "This isn't a new issue. But the threat has evolved." He continued:

Since 9/11, the United States has seen a series of attempted attacks on commercial aviation. A shoe bomber. Liquid explosives. An underwear bomber. And a plot to detonate explosive cargo. Most of these were disrupted just in time, but our enemies have not always failed.

It's time to "raise the global baseline" of aviation security, said Kelly.

"Inaction is not an option," he added. "Those who choose not to cooperate or are slow to adopt these measures could be subject to other restrictions, including a ban on electronic devices from their airplanes, or even a suspension of their flights to the United States."

It almost goes without saying that pressure to get in line with the new security requirements will be enormous, since laptops and tablets are ubiquitous in business travel.

DHS says the new security requirements will "be implemented in phases over the next several weeks and months."