Utilize the input text as a context reference, choose the right relationship between 'Shuttle America' and 'Republic Airways Holdings' from the options.
Options: position held, subsidiary, parent organization, director/manager

Republic Airways Holdings —parent of Republic Airlines and Shuttle America —posted second-quarter net income of $4.3 million, down 78.6% from a net profit of $20.1 million in the year-ago period.
parent organization