The trial of three former British Airways bosses and its present global director of sales has collapsed.
Richard Latham QC, prosecuting for the Office of Fair Trading (OFT), told the judge at Southwark Crown Court in London that he would offer "no evidence", reports say.
BA's global sales and marketing director Andrew Crawley, ex-commercial director Martin George, former head of communications Iain Burns and ex-head of sales in the UK and Ireland Alan Burnett, had pleaded not guilty.
All four were accused of colluding with rival carrier Virgin Atlantic to set fuel surcharges on ticket prices between 2004 and 2006.
The OFT had failed to disclose key evidence, the court heard.
A recently discovered email suggested Virgin had made an increase in its fuel surcharge without consulting BA, weakening the claims of collusion between the two airlines.