The Air Transport Auxiliary (ATA) was a British civilian organisation set up during the Second World War and headquartered at White Waltham Airfield that ferried new, repaired and damaged military aircraft between factories, assembly plants, transatlantic delivery points, Maintenance Units (MUs), scrap yards, and active service squadrons and airfields, but not to naval aircraft carriers. It also flew service personnel on urgent duty from one place to another and performed some air ambulance work.