Take context from the input text and decide on the accurate relationship between 'Shuttle America' and 'Republic Airways Holdings' from the options provided.
Options: subsidiary, position held, director/manager, parent organization

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