Bryan Bedford, President Trump’s nominee to lead the Federal Aviation Administration, will face questions from senators on Wednesday at a critical juncture for an agency confronting staffing shortages and mounting concerns about passenger safety.

Mr. Bedford spent decades running and revamping regional commercial airlines, including Republic Airways, where he currently serves as president, chief executive and director.

He is expected to tell members of the Senate Committee on Commerce, Science and Transportation reviewing his nomination that “if confirmed, my top priority will be public safety and in restoring the public’s confidence in flying,” according to a copy of his prepared remarks shared with The New York Times. He is expected to add that he will work “to build a new, best-in-class air traffic control system, and to rectify the chronic understaffing at our nation’s air centers.”

In a recent questionnaire obtained by The New York Times that Mr. Bedford prepared for the committee, he pledged to use his management experience in the private sector to address longstanding technology problems and staffing gaps that were highlighted by the deadly Jan. 29 midair collision between a commercial flight and a military helicopter at Ronald Reagan National Airport.

In the months since the crash at Reagan National Airport, a series of near misses and outages at major airports have drawn fresh attention to risks posed by the F.A.A.’s outdated tracking systems and understaffed air traffic control towers.

The next administrator of the agency — which has had five leaders in the last four years — will be under pressure to correct those problems, even as the F.A.A. sustains staffing cuts elsewhere as part of the Trump administration’s downsizing of the federal government.