British Airways is making precautionary checks on five of its seven Concorde jets after discovering "small cracks" in the roof structure of one of them, aviation officials said.

The Civil Aviation Authority said Thursday that the airline was checking planes that have made more than 3,500 landings before they take five more flights. French airline officials are making the same checks on Concorde jets, it added."No Concorde is flying with British Airways which has any cracks," said a British Airways spokeswoman, who did not give her name in keeping with British practice. The authority said cracks on the Concorde were discovered during maintenance work.