NEW WINDSOR – The Port Authority and Norwegian Air will formally announce the details of the budget carrier’s plans to offer flights between Stewart International Airport and Europe Thursday.

Ed Harrison, Stewart’s general manager, emailed invitations Tuesday to a “special announcement” at the airport without offering any additional details. But Anders Lindstrom, a Norwegian spokesman, said the airline plans to announce the starting dates for service, including routes and fares, now that it has received final approval from the Federal Aviation Administration.

After granting Norwegian preliminary approval in December, the FAA conducted the requisite safety review of the carrier’s operations and this week gave it the green light to fly to and from the United States. The FAA said its operational specifications permit Norwegian to use seven Boeing 737-800 planes to provide service to Stewart, T.F. Green Airport in Providence, R.I., and Bradley International Airport in Windsor Locks, Ct.

The flights will originate from Ireland and Scotland.

Representatives of U.S. pilots unions, which have lobbied aggressively against Norwegian’s expansion, met with President Trump last week to ask him to deny this final approval.