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The strain of a 34-day partial government shutdown is weighing on the nation’s air-travel system, both the federal workers who make it go and the airlines that depend on them. Air traffic controllers and airport security agents continued to work without pay — they will miss a second biweekly paycheck Jan. 25 — but high absentee rates raise the threat of long airport lines, or worse.

WASHINGTON — Officials representing the United States, Canada and Mexico expressed support for advancing the treaty that is meant to serve as a replacement for the North American Free Trade Agreement.

America’s manufacturers are scrambling to change the way they do business — from finding new suppliers to shifting more finishing work overseas — as the sting of tariffs begins to take a bigger toll on their bottom lines.

The U.S. growth outlook hangs more than ever on American consumers’ resilience amid stock market swoons and trade-war tensions, but key data on their spending — the biggest part of the economy — will be missing due to the government shutdown.

Organizers for this year's gathering of the Transportation Research Board in Washington have come up with a list of a dozen topic areas that policymakers need to address to ensure a sustainable transportation network.

WASHINGTON — Time-sensitive delivery is here to stay, and that will change methods of freight movement, said one expert speaking at the Transportation Research Board’s annual meeting.

The Transportation Security Administration plans to begin closing a handful of security checkpoints at airports around the United States as soon as this weekend in response to staff shortages triggered by a partial federal government shutdown now in its third week.

Almost a third of the $2 trillion that U.S. states spend each year comes from Washington, so the partial shutdown of the federal government would seem to spell major financial trouble in America’s statehouses.