Following on from the thread about have you ever called 999, have you ever needed an air ambulance, either for yourself or anyone that you've helped?
When my Mother had a brain haemmorhage and stroke the hospital she was blued via ambulance for said she was so unwell they possibly needed to airlift her to a London specialist hospital, and the air ambulance had been notified. We were incredibly lucky that she stabalised so it wasn't needed in the end, and are eternally grateful that it was an option available to us.