The Locust, an anti-drone laser system that has been used recently along the border with Mexico, last month in Albuquerque, N.M.

Travelers at Denver International Airport last week. On Monday afternoon, insufficient air traffic controller staffing caused arriving flights to be delayed about 40 minutes.

New commuter train tunnels are set to be built under the Hudson River in a project known as Gateway. New York has been a main target of the Trump administration’s push to freeze and claw back federal funds from states.

Twenty of the 472 stations in New York City’s sprawling subway network had to be temporarily closed on Monday night.

Janno Lieber, the chief executive and chairman of the M.T.A., says that there is no Plan B if congestion pricing is killed by Washington.

An Alaska Airlines Boeing 737-900ER at John F. Kennedy International Airport in New York earlier this month.

The Alaska Airlines plane that lost a piece of its fuselage on Friday, parked outside a maintenance building at the airport in Portland, Ore., this weekend.

An Alaska Airlines Boeing 737 Max 9 aircraft in Seattle in 2021.

The derailments of two trains left 26 people injured, but no one was seriously hurt.

The subway derailment on Thursday, which happened near the station on 96th Street and Broadway, was the first involving passengers in several years.

A 16-foot clock with gold accents was installed without permission outside Trump Tower more than a dozen years ago.