Southwest Airlines will cap every passenger at a single portable charger starting April 20, barring the devices from overhead bins and checked luggage in what the carrier calls a direct response to the growing threat of lithium battery fires at cruising altitude.
The Dallas-based airline's vice president of safety and security, Dave Hunt, laid out the new rules in an internal message to employees, first reported by Fox Business. Each traveler may bring one lithium-powered charger rated at no more than 100 watt-hours. The device must stay on the passenger's person or inside a bag stowed under the seat, never in an overhead compartment.
The restriction lands at a moment when lithium battery incidents aboard commercial flights are no longer rare events. They are an accelerating trend that regulators and safety experts say can turn a routine flight into an emergency in seconds.
The case for tighter rules writes itself in incident reports stretching back nearly a decade. In 2016, an American Airlines flight from Detroit to Dallas diverted to Wichita Falls, Texas, after a portable power pack emitted fumes and was suspected of entering thermal runaway, the chain reaction in which a lithium cell overheats, ruptures, and ignites neighboring cells.
Weeks later, a Delta Air Lines flight pushing back from the gate at Newark saw a portable battery catch fire inside a seat pocket. The Federal Aviation Administration said the incident delayed the flight by more than half an hour.
The problem did not fade. In 2022, crew aboard an American Airlines flight responded to a laptop that began smoking and burning inside a passenger's backpack before the plane reached the gate. A year later, a Spirit Airlines flight from Dallas to Orlando diverted to Jacksonville after smoke poured from an overhead bin. When a bag was opened, the smoke became a fire. Passengers suffered burns and smoke inhalation.
Earlier this year, a United Airlines flight diverted when a passenger's battery started smoking, one more entry in a lengthening logbook.
The FAA tallied 97 lithium battery incidents in 2025, AP News reported, while UL documented a 42 percent increase in portable-charger incidents that same year. A January 2025 fire aboard an Air Busan plane in South Korea forced the evacuation of all 176 people before flames burned through the aircraft's roof.
Southwest said it will notify travelers about the one-charger limit during booking and check-in, through airport signage, and via onboard announcements. The airline is treating this as a system-wide safety mandate, not a suggestion.
Hunt framed the move as consistent with the airline's broader safety culture. In his employee message, he stated the policy is aimed at strengthening the carrier's ability to, in his words:
"contain and mitigate lithium battery incidents, including reducing the risk of battery fires."
He added:
"Our approach reflects our culture of safety and security in action: proactively managing risk and caring for our customers and people at every step."
The April 20 rule tightens a restriction Southwest introduced roughly a year earlier, when the airline first required passengers to keep portable chargers in plain sight while in use. That earlier policy, which Breitbart noted took effect on May 28 of the prior year, was built on a simple premise: if a battery overheats, the crew needs to see it immediately.
A Southwest spokesperson explained the reasoning behind the visibility requirement at the time: "In the rare event a lithium battery overheats or catches fire, quick access is critical and keeping power banks in plain sight allow for faster intervention and helps protect everyone onboard."
Now the airline has concluded that visibility alone is not enough. Limiting quantity and banning overhead storage removes the scenario that produced the worst outcomes, a charger buried in a bag, out of sight, in a compartment passengers and crew cannot easily reach.
Steven Arroyo, an air safety expert and retired United Airlines captain, called the restrictions a necessary response to a potentially catastrophic hazard. His language left little room for ambiguity, as he told Fox News:
"I think it's a step in the right direction... to address the potential for these lithium batteries when they overheat leading to a thermal runaway."
Arroyo described what thermal runaway means in practice at altitude:
"That's the worst thing you could have happening on board an airliner at 35,000 feet. It's basically an uncontrollable fire."
David Wroth of UL Standards & Engagement echoed the concern. "It's definitely a serious risk," Wroth said, pointing to the rising frequency of incidents across the industry.
The charger crackdown arrives during a period of sweeping operational changes at Southwest. The airline has been overhauling long-standing policies at a pace that has startled loyal customers, from abandoning its iconic open-seating model to restructuring its route network.
Southwest also plans to equip its entire fleet with in-seat power by mid-2027, a move that could reduce passenger dependence on portable chargers altogether. If every seat has an outlet, the argument for hauling a bulky battery pack weakens considerably.
That timeline, however, is still more than two years away. In the interim, millions of travelers will board Southwest flights carrying phones, tablets, and laptops that burn through charge faster than ever, and many will want a backup battery.
The airline has also pulled out of major airports and faced pushback on its assigned-seating rollout, leaving some frequent flyers wondering whether the carrier they chose for its simplicity is becoming something unrecognizable.
Southwest deserves credit for acting before a federal mandate forced its hand. But the patchwork nature of airline-by-airline rules raises an obvious question: why hasn't the FAA imposed a uniform standard across all domestic carriers?
Asian airlines moved first after high-profile fires overseas. American carriers have responded individually, at different speeds, with different thresholds. Southwest now limits passengers to one charger. Other airlines have imposed visibility rules but not quantity caps. The result is a confusing quilt of policies that varies by carrier and leaves enforcement largely to gate agents and flight attendants who are already stretched thin.
The FAA tracks the incidents. It publishes the data. It warns about thermal runaway. Yet the agency has left the actual rule-making to airlines acting on their own initiative. That is a gap, and gaps in aviation safety have a way of closing only after something goes badly wrong.
Southwest has also faced passenger backlash over recent policy shifts, and the charger limit will likely draw complaints from travelers who rely on multiple devices during long flights. But inconvenience is a weak argument against a rule designed to keep a pressurized aluminum tube from filling with toxic smoke at 35,000 feet.
Hunt said the policy reflects Southwest's effort to improve its safety culture while reducing injuries, damage, and security incidents. If the data supports the risk, and the incident list makes clear it does, then the only real question is why every airline hasn't done the same thing already.
When a private company moves faster than the federal bureaucracy to protect passengers, that tells you everything you need to know about which institution is actually doing its job.