Detailed Instructions: Generate a correct and concise answer for the question based on the words in the context.
Q: Context : Bangkok Airways Flight 266 was a scheduled domestic passenger flight to Samui Airport, Thailand, which overran the runway on landing and crashed into an old and unmanned control tower on 4 August 2009.
Question : What is the date when Bangkok Airways Flight 266 happened?
A:
4 August 2009