Avro 707A Test Flights Successful-New Picture Delta Wing Is Shape Of The Future -- This latest air-to-air picture of the Avro 707A Delta high-speed research aircraft was made during one of the many test flights, all of them successful, which form part of a big development programme. Clearly shown are the air intakes at the wing roots - one of the main features distinguishing this aircraft from its earlier version, the Avro 707B. In that plane, a lower speed machine, the single intake is behind