Q: In this task, you are given a context tweet and an answer. Your job is to generate a question for the given answer based on the given tweet paragraph. Note that your question should be answerable based on the given tweet, and the answer to your question should be the given answer.
Context: 1 flight out, 1 flight in. It took CSN306S almost 4h to fly 660 km from Dhaka to Kathmandu #NepalEarthquake Flightradar24 (@flightradar24) April 27, 2015 Answer: csn306s
A:
what was the flight number mentioned?