<sod >Cost performance for the full year will continue to be strongâ Investors were left unimpressed with the company's results, sending the airline's shares down nearly 6 per cent in early trading in London.< eod>< sod > Cost performance for the full year will continue to be strongâ Investors were left unimpressed with the company's results, sending the airline's shares down more than 7Â per cent.< eod>