Hundreds of thousands of stranded travelers scrambled to make new connections and get through to airlines on jammed phone lines Sunday after the attack on Iran by the United States and Israel shut down much of the Middle East to air travel.

Tourists and business travelers crowded hotels and airports, with no word on when many airports would reopen or when flights to and through the Middle East would resume.

Shutdown airports in Dubai, Abu Dhabi and Doha — including Dubai International Airport, one of the busiest in the world — are important hubs for travel between Europe, Africa and the West to Asia. All three were directly hit by strikes.

“For travelers, there’s no way to sugarcoat this,” said Henry Harteveldt, an airline industry analyst and president of Atmosphere Research Group. “You should prepare for delays or cancellations for the next few days as these attacks evolve and hopefully end.”

Mike McCormick, who used to oversee air traffic control for the Federal Aviation Administration, said countries might reopen their airspace once American and Israeli officials tell airlines where military flights are operating and how capable Iran remains at firing missiles.

Fintech company Block lays off 4,000

Financial technology company Block announced it was laying off more than 4,000 of its 10,000 plus employees, reconfiguring to capitalize on its use of artificial intelligence.

“The core thesis is simple. Intelligence tools have changed what it means to build and run a company,” Jack Dorsey said in a letter to shareholders in Block, the parent company to online payment platforms such as Square and Cash App. “A significantly smaller team, using the tools we’re building, can do more and do it better,” he said.