The airline posted strong Q4 earnings but said the government shutdown has reduced revenue so far this month by as much as $15 million.
The airline's unit revenue increased 1.1% in the third quarter even though the the recent hurricanes forced the cancellation of 8,000 flights.
The airline forecasts passenger unit revenue will range from flat to a 2% increase in the first quarter of 2017, ending two years of quarterly declines.
