I was a bit surprised to hear when I went home for Christmas that my 1 year old child was too big for the bassinet... but different airlines, seem to have different weight limit of their bassinets!
at Singapore Airlines they could provide a bit bigger bassinet, up to 15 kilos I believe.
Thai - only have bassinets for small babies, when we went home for Christmas with Thai he had to sleep in my arms the whole way....
Malaysian Airlines - seem to be ok with toddlers... last year, sat next to a mom with a 18-months who could sleep in the bassinet.
Any more experience to share? We are soon flying with Australian Airlines to Cairns... over night....