I`ll be taking Mrs. disko for a holiday soon to Singapore with SQ and want to do an online checkin so I can try to get the best seats possible (in Y). So I checked www.seatguru.com . Unfortunately this tells me that SQ have 4 different versions of the 747-400, with slightly different seating configurations. Does anyone know which version will be likely used on the SQ321 from LHR to SIN ? ^