Refer to the input text as context and select the correct relationship between 'Shuttle America' and 'Republic Airways Holdings' from the available options.
Options: parent organization, position held, subsidiary, 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