Also the CAA stats are based on the time off blocks, not the time airborne, so if it pushes back on schedule but is then late due to back tracking aircraft then this would be reflected on its arrival time, which RJ said was running on time most of the time. Also how long must an aircraft wait at the hold for an aircraft to land and backtrack? 90 second? It's not as big a problem that is being made out, not until, as SWBKCB alludes to, capacity is reached.