Lori Aratani

The shutdown may be over, but the task of fixing deficiencies that have dogged the nation’s aviation system is far from complete.

Flight operations are expected to gradually return to normal following the government reopening, but there are still hundreds of expected cancellations Thursday.

A bill to end the shutdown will be taken up by the House this week, but airlines and experts warn that it will take time before operations return to normal.

The House is set to take up a bill to reopen the government after it passed the Senate. Airlines for America said flight schedules cannot “bounce back” immediately.

Over 1,500 flights scheduled for Monday have been canceled, as the toll of the longest-ever shutdown continues to grow for Americans.

Airlines have canceled more than 1,000 flights to comply with a shutdown-related FAA directive to reduce traffic at 40 airports, including Atlanta, Chicago and Dallas.

The Trump administration says the move, which will affect dozens of markets, is part of an effort to ease pressure on air traffic controllers.

The bomb threat targeted an inbound United Airlines flight.

The nation’s aviation system faces new strains amid growing concern that critical front-line employees working without pay might stop showing up for work.

The delays came after Transportation Secretary Sean P. Duffy warned the shutdown could add to the strain on air traffic controllers and lead to cancellations.