You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "RAAF Base Richmond is an Royal Australian Air Force base, located within the City of Hawkesbury, and at times, been mooted as a site for Sydney's proposed international what?" whose answer is Second Sydney Airport.
Each document should contain about 30 words, and these documents should contain useful information.

Query: RAAF Base Richmond Sydney international airport
Useful Output:

Doc 1: This is a list of current and previous Royal Australian Air Force airstrips, aerodromes and bases. The air force also owns and maintains bare bases in remote
Doc 2: RAAF Richmond airbase (XRH/YSRI) is a big and important RAAF base about 50 kilometers northwest of Sydney area.
Doc 3: Airports 1 to 50 ; Hawkesbury Hospital Helipad. Windsor, · 3 km (1 nm) E ; Castlereagh Aerodrome. Sydney, · 11 km (6 nm) SW ; RAAF Station Schofields.
Doc 4: RAAF Richmond is an Australian military base located just outside Sydney  Sydney's second international airport (after SYD / YSSY).
Doc 5: RAAF Base Richmond is located in Australia, using iata code XRH, and icao code YSRI.Find out the key information for this airport.