British Midland has launched a special fare price, the `Open Jaw' ticket, allowing passengers to travel London to Dublin/ Belfast and returning via the other airport on one fare. The airline's chairman, Sir Michael Bishop, who was in Dublin to mark the opening of the airline's new business lounge and facilities, said that an additional Airbus may operate on the Dublin-London route in October, depending on demand. "The market is so big now between the UK and Ireland, particularly from London. You are talking about four million passengers a year," he said.