Even though you were causing the delay technically, I still think sighing is soooooooo YARGH! Especially stranger to stranger.... I would apologize to people who were patiently (quietly) waiting, but I wouldn't appease to PA lady by apologizing... though I wouldn't have the nerve to give her a look either. I'd probably just be happy and friendly to whomever directly engaged me and go on my merry way

Though on the drive home, I'd come up with a gazillion great zingers to have said to her

ETA: My manually typed smiley came out as an "eye-popper" haha
ETA2: spelling

sorry