The criteria for these four categories were: Emergency – 999 calls or doctors’ emergencies which require an aircraft to be activated as soon as possible.Very urgent – Time for air ambulance to be with patient up to six hours.Urgent – Time for air ambulance to be with patient up to nine hours.Planned – This category applied when ordering doctors considered it necessary, because of the patient’s medical condition, that he/she was transported to hospital by air ambulance, but where it was not required to get...