I've not missed a flight like that, but I did drop my wife off at the terminal a day early!! Somehow we both messed that up, thinking she was leaving on a Monday instead of Tuesday. She caught me before I got far, so I could come back and get her. Since we live about three and a half hours away, we got a hotel and just enjoyed the evening together. It actually turned out pretty nice. Needless to say, she wasn't late the next day. ;)