United Airlines on Tuesday is unveiling upgraded interiors on new Boeing 787 Dreamliners as it seeks to reassure customers after a series of issues and hundreds of flight disruptions in recent weeks at its nearby hub of Newark Liberty International Airport.

The airline told the Sun the e-mail was sent to passengers who have upcoming flights to or through Newark’s airport, as well as its MileagePlus

The crucial travel hub for United is still struggling to recover from air traffic control glitches that have already disrupted hundreds of flights.

United CEO Scott Kirby tried to allay trepidations travelers might have about flying in and out of Newark Airport as issues mount.

United Airlines cut 35 daily round-trip flights at Newark Liberty International Airport Friday, citing Federal Aviation Administration technology failures and staffing issues that resulted in five days of excessive delays — including one flight from Boston that was set back more than five hours.

Staff shortages and equipment failures at Newark Liberty International Airport have raised safety concerns in recent weeks.

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Transportation Secretary Sean P. Duffy said it is still safe to fly from Newark Liberty International Airport, but flights to the beleaguered facility need to be scaled back after air traffic control systems suffered several outages,