By JOHN SEEWER

Hundreds of flights at the busiest airports in the U.S. are being scratched this weekend as airlines move forward with reducing air service due to the lingering government shutdown .

So far, the government-ordered slowdown across the airline industry that began Friday hasn’t caused any widespread disruptions .

But analysts warn that the upheaval will intensify and be felt far beyond air travel if the cancellations pick up and move closer to the Thanksgiving holiday.

Already there are concerns about the impact on cities and businesses that rely on tourism and the possibility of shipping interruptions that could delay getting holiday items on store shelves.

Here’s what to know about the flight reductions:

How many flights have been canceled?

The first day of the

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