United States aviation authorities are bracing for widespread travel disruption when as many as one in 10 domestic flight services are cut from daily operations at 40 major airports amid the ongoing government shutdown.

The halt to government work, which has become the longest political standstill in US history, has seen air traffic control staff members not coming to work because they are not being paid.

Their absences have caused flight delays, with more than 3.2 million passengers impacted nationwide.

The Federal Aviation Authority (FAA) this week said it planned to reduce national air traffic in the US by 10 per cent in "high-volume" markets from 6am Eastern Time on Friday (9pm Friday AEST) to maintain travel safety.

The Trump administration's Transportation Department later releas

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