The short answer is, you don't. You carry the infant TO the airplane in the carrier, staff take if off you, and you then put the baby in the bassinet you have previously arranged to have in place with the carrier when you booked your ticket. Bassinet mounts on the bulkhead in front of the front row of seats. Works quite well, actually. Gives you a bit of space, the baby tucks in nicely and has at least a fighting chance of getting some kip. And, oddly enough, the armrest height is such that it supports your arm holding the baby quite well for feeding and cuddling.