Mass flight cancellations are set to start Friday due to strains from the federal government shutdown. Here's how airlines are responding.

A small percentage of domestic flights were canceled on Friday, but Transportation Secretary Sean Duffy said the reductions, which were already going to increase next week, could sharply rise by the holidays if the shutdown continued.

Major airlines say that most passengers whose flights are canceled, and many who choose not to fly, will be eligible for refunds and no-fee rebookings.

Several airlines at Orlando International Airport (MCO) said they are offering flight changes, re-bookings, cancellations or refunds without penalty to customers affected by the Federal Aviation Administration's decision to reduce air traffic by 10% at 40 airports.

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The rail service said it began to see those bookings grow before the shutdown began — but told The Associated Press on Thursday that it was also “reasonable to expect an increased share shift to Amtrak” if flight disruptions mount. Amtrak has maintained that its routes are running normally amid the shutdown.

The FAA will reduce air traffic at 40 airports beginning Friday. Philadelphia International Airport is among those expecting flight cuts and delays. Talks between Democrats and Republicans to end the shutdown are intensifying,