Torc Telecom has signed an agreement with Debonair to sell international pre-paid calling cards on board all the low-fare airline's planes, the Irish telecommunications company said yesterday. Torc cards are to be sold in-flight from the duty-free trolley to passengers on flights between Barcelona, Madrid, Paris, Dusseldorf, Munich, Rome, Nice and London, Torc said. The deal follows another contract with Hughes & Hughes bookshops at Dublin airport, the company added. The pre-paid cards provide users with a free telephone number, which gives them a dial tone to make calls at reduced rates.