Hawaiian will start deploying Starlink broadband with "select" aircraft in 2023. There aren't any plans to add satellite access to the Boeing 717 airliners that provide short-hop flights between Hawaii's islands.
The Hawaiian Airlines arrangement won't necessarily guarantee more in-flight business for SpaceX. Some major airlines already offer satellite internet service to passengers, and might not be in a rush to replace equipment that sometimes took years to install. The new deal gives SpaceX a significant foothold, however, and it won't be surprising if more airlines try Starlink before long.