Knowledge is power, and KVS was invaluable earlier this year when I was stranded in Asia thanks to the ash clouds. Real time availability could show me where KLM had seat availability whilst the airline was saying on the phone that all flights were full. Two days later, when that flight was also cancelled, I could do a full all-Asia to Europe check and find what was available, and call the airline with the information.

The flight I found (which was eventually overbooked by 80 people) resulted in me coming home to Europe via a new routing, rather than sitting in Asia for a further three days at minimum.

Well done KVS! ^