Airplane accidents are very very rare – you are more at risk of getting injured crossing the road – so always Stop, Look and Listen! But yes, airplane accidents do happen. Like any accident human error is usually involved somewhere along the line but they are so rare I don’t think we have anything to worry about. Engineers work very hard to make things like airplanes as safe as possible for us all 🙂
Caoimhe is right – travelling in a aeroplane is pretty much the safest way to get around, largely because engineers have studied them so much.
My favourite TV programme is Air Crash Investigation: they do really good reconstructions showing what happened and how the engineers and scientists go about their investigations.