I am thinking of flying into SIN on Air Asia and staying airside at the Ambassador Hotel, will be departing the next morning on UA at 0600. Is there a transfer desk airside or if not, if I print out my BP will that be all I will need to do, as I have only carry-on, or will I need to exit through immigration and customs and then check-in with UA. I do know that sometimes even though you have done OLCI they want you to get a stamp on your BP before going through customs and security. Anyone have any experience doing what I would like to do?