***** Prove Themselves As Shape Of The Future -- This is one of a new air-to-air shot of the Avro 707A delta high-speed research aircraft taken during one of the scores of successful test flight which form part of a big development programme. Clearly shown are the air intakes at the wing roots. The Avros Company states that since the 707A fir flow in July this year now data have been gathered which point the way to acceptance of the delta wing as the inevitable shape for many aircraft types in t