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Virgin aims to block BA-AA tie-up
sir richard branson is launching a campaign to try to block the proposed tie-up between british airways (ba) and american airlines aa) .
'major battle' we are going to wage a major battle to stop the two largest airlinews in the world effeuctively working as one carrier, sir richard told the bbc's today programme .
british airways and its us rival are not aiming for a full merger .