JUST IN: Four people are dead, including children, after a vehicle plowed through a building housing an after-school camp in Illinois.

Nationwide ground stop

Some flights have resumed, but getting air traffic back to normal won’t be quick, authorities warn. Here’s what to know.

The Saturday Essay

How AI is becoming the ultimate political power

SYSTEM OVERLOAD

Another major outage rocks US after Microsoft, FAA failures

New York Metro

Exclusive: NYC beauty boss sick of X-rated antics, creepy clients from alleged upstairs brothel at trendy storefront

Top Story

Widely used diabetes drug may offer unexpected health benefit

Airlines are rushing to recover from a US systems outage that left planes and crews out of position and customers stranded

Murder investigation launched after 27-year-old man stabbed to death

Trilateral summit

President Trump, Russia's Vladimir Putin and China's Xi Jinping will meet in China next week, the White House says.

Financial Times

The Weekend Essay: Will we find a cure for cancer?

Sam Kiley

Putin’s latest demands to Europe on Ukraine – bend the knee for peace

Trans law risks sending teachers to prison, school leaders warn

'VERY HAPPY BIRTHDAY TO KING'

William and Kate's message for King Charles on 78th birthday

U.S. Flights Snarled

Thousands of travelers remain stranded after an hourslong ground stop ended on Friday night. Follow updates.

In Focus

The Maga extremists plotting a post-Trump America – where women lose the vote

Exclusive

The IAEA can’t verify the location or status of Iran’s stockpile of near-bomb grade uranium as the country continues to shut out UN inspectors