Hi bingbangbong,

We have never used a car seat on a plane, so can't answer your first question.

As for acceptable car seats and also useful information about BA provided cots, take a look here
http://www.britishairways.com/travel...e/public/en_gb

Is it needed? People differ, some believe it is a safety issue. We have always been fine saving money, using the cots/bassinets. We check our combo stroller/car seat at the gate and get it as soon as we get off the plane.

Begemot