The Refuelling taking place in the air. ***** The system, revealed here for the first time, was evolved by Sir Alan ***** collaboration with imperial airways. It means: 1. Safety in taking off on long-distance flights; 2. Safety in fuelling; 3. Safety in having adequate supplies of petrol. At present, a pilot about to take off on a long distance flight is torn between the desire to have sufficient petrol to meet all emergencies and the doubt as to whether the Wight will allow his 'plane to rise.