Task: Question Generation
Input (English): Context : British Marine Air Navigation Co Ltd was formed in 1923 in a joint venture between Supermarine and Southern Railway (owners of Southampton Docks), the Woolston base becoming Britain's first commercial flying boat base, with its own Customs and Immigration facilities. 
Subject : British Marine Air Navigation Co Ltd 
Relation : parent company
Output (English): What is British Marine Air Navigation Co Ltd's parent company?