car seat on plane for 18 month old - would you?

[smother]

We're flying to Australia with my 18 month old DS with Air China.

I've had conflicting advice about whether to take a car seat for him for the flight.

Please could you let me know what your experiences of taking car seats on long haul flights are.

Is it ok not to use a car seat for a toddler? If not, what sort of car seat did you take?

Hi ! I was wondering if anyone has flown on Air China (NYC to Beijing) with a car seat? I was told that they do not permit them for any child, regardless of age. I am having a mild panic, because I just bought my 16 month a seat!! Please advise !