unfortunately the sound quality has suffered a little but it does get better throughout the film. I hope it doesn't detract too much. theres some great footage of the Royal Flying Corps which wiki describes thus;
the Royal Flying Corps (RFC) was the over-land air arm of the British military during most of the First World War. During the early part of the war, the RFC's responsibilities were centred on support of the British Army, via artillery co-operation and photographic reconnaissance.