By Guy Taylor Low-cost airlines Ryanair and Wizz Air have reported record August passenger numbers as travel demand continues to soar in one of the busiest summers ever. Some 20.5m travellers flew with the Irish budget carrier in August, up eight per cent year-on-year and at a load factor of 96 per cent. Its Hungarian rival carried 6.2m, up one per cent despite ongoing capacity restrictions stemming from problems with its Pratt and Whitney-supplied engines. Ryanair’s rolling traffic total for this year now sits at 192m, also up eight per cent on a year in which travel demand rebounded spectacu…