Correct. The concourse A end clubs also have more limited hours on Saturdays (6:30AM - 4:30PM). Someone also posted that the A18 end club closed earlier than 9PM on a day they were there (presumably a week-day). The south end seems to have fewer flights than north end, so would not be too surprised they might close A18 early at times. Although we are now getting into busier summer season schedule so suspect that is less likely during this time of year.