There's a reason we are told to be at the airport two hours in advance.  Had I left earlier, I wouldn't  have missed my flight at 7:30pm the Friday before labor day. \nThe US Air representative was kind enough to rebook me on the next flight out.  Unfortunately the next flight wasn't until 6 am the next morning.   Since it was Labor Day weekend; the check in line was long. I decided to grab a quick bite to eat then come back.   I returned less than 15 minutes later and gone were the customer service representatives,  and  self service check in counters had closed. \nI thought maybe they took a lunch break or something.  So I waited,  waited, and waited some more.  There were several other US Air passengers there also. I  also checked Us Air's , but no one was there either. \n I called the customer service line, and was transferred to US AIR's Hartsfield Jackson  number.  Frustrating doesn't even begin to describe how one feels when the customer service number rings the check in counter you're standing in front of.  Anyway I spoke with the same customer service 4 different times before she  told me US Air's reps would not return until 3:30am . \nThere is absolutely no excuse that I had to call customer service FOUR times before getting a straight answer.   Someone should have been able to assist me by my second call. That's not an unreasonable expectation, is it? \nAtlanta Hartsfield Jackson is nation's busiest airport. As such someone should be on call especially on holiday weekends where increased travel should be anticipated.  Delta and Air Tran both had customer service representatives on call.