rtokens: The conditions for clearance of the alliance were that British Airways and American drop 168 slots at London Heathrow airport , the busiest in Europe .
pos: NN NNS VBD EX VBD DT JJ NN IN JJ NNS CC VBD DT NN IN NN IN IN DT NNP JJ NN MD VB VBN .
tokens: Industry sources said there was no new date for fresh talks and blamed the deadlock on uncertainty over whether the British Airways-American deal would be cleared .
ltokens: His comments came just minutes after the latest set of open skies talks ended in London with no deal signed .