This train is on time 99%. And as Mr Goswami said..get down at Santagachi and take a taxi to the Domestic terminal of the airport.However get down here only in case of a delay exceeding 1 hr as getting taxi at 5.30 am or so is slightly difficult.In case the train is running on time or reaches Santragachi early, please to get down at HWH where more convenient options are available.