Trial Trip of Express Air Line - The Diana Photographed at Hatfield aerodrome this afternoon May 22. The Diana, the new De Havilland express air liner, the fastest four engined air craft in the world, was demonstrated at Hatfield aerodrome this afternoon May 22. The machine will operate the section of the Australia route between Singapore and Brisbane. It will make a tour of Britain as part of the empire Air Day program. July 02, 1934. (Photo by Associated press Photo)