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To use the feature, you can send a tweet to @VAAInfo with your flight number and departure in the format "VSXX DDMM."
For instance, if you were on flight four leaving on Nov. 22, you would tweet "@VAAInfo VS4 2211," and the bot would tweet back something like, "@you – Hello gorgeous! The @VirginAtlantic VS4/22Nov is leaving New York JFK at 18:00 & landing in London LHR at 06:20/23Nov."
Those with multi-leg journeys are asked to add the airport code of their most recent departure city, i.e. "@VAAInfo VS20 1503 HKG."