How soon was the attack canceled?

Mr. Trump said he called off the strike with 10 minutes to spare. No missiles had been fired at that point, but a senior administration official said American military planes were in the air and ships were in position. Mr. Trump later denied that the planes were in the air when he changed his mind about the operation. Officials said the strike was to be carried out in the early morning hours on Friday, which would have been around 9 p.m. Thursday in Washington.

Is this crisis affecting anything else?

Some international airlines on Friday diverted planes flying over parts of Iran and the Strait of Hormuz, and the Federal Aviation Administration gave an emergency order early Friday, banning all American flights in Tehran-controlled airspace above the Persian Gulf and Gulf of Oman because of “heightened military activities and increased political tensions.”

Oil prices for Brent crude, the international standard, rose about 5.8 percent since the American drone was shot down. It was trading at about $64.80 a barrel on Friday morning, which is below the recent high in mid-May when prices were about $72 a barrel.

About a third of the world’s crude oil and other petroleum products is carried by tankers that pass through the Strait of Hormuz, described by one federal agency as one of the most important oil choke points in the world. The body of water separates the United Arab Emirates and Oman from Iran and sees dozens of ships pass through each day.

Read on: Airlines Divert Flights Around Iran After U.S. Drone Is Shot Down

Further context: The Oil Market Shows It Can Take a Punch