Five passengers were injured, and one was hospitalized.
“Business Priority” will become available early next year.
One connection will be discontinued, while another will switch to scheduled air service.
The carrier cautioned that operating profits could fall this year.
Service between Williamsport and Washington Dulles came to a halt on Saturday.
The manufacturer is now authorized to begin commercial production of the aircraft.
The new agreement also releases $300 million in accrued retention bonuses to the pilots.
The dispute centers on a 2025 arbitration board ruling in favor of the instructors.
The flight attendants walked off the job on Sunday, forcing hundreds of cancellations.