On the first day that airlines started to trim flights in accordance with a federal directive to reduce air traffic during the government shutdown, the Indianapolis International Airport on Nov. 7 bore few signs that anything was out of the ordinary.The departure and arrival boards showed a handful of canceled flights , but travelers remained upbeat and determined, even as travel plans remained up in the air.

Airlines cut 4% of flights out of 40 high-traffic airports across the country, including Indianapolis International Airport , following an order from the Federal Aviation Administration as the shutdown stretches on and air traffic controllers work without pay.

On Friday as many as 3.5 million passengers across the United States saw their flights delayed or canceled, according to

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