However, when I looked at the final print out I realized that the last flight -- a flight from Charlotte to O'Hare -- is a bit interesting. In one flight, it combines airlines headquartered in every metro area I've lived in for more than 2 months.
The flight has a US Airways flight number. US Airways is headquartered in Phoenix (America West took the US Airways names after the recent merger, but kept their headquarters), and now includes America West -- headquartered in Phoenix -- and PSA -- headquartered in San Diego -- as ancestor carriers. However the actual flight is actually a United Express flight. United, and thus United Express, are headquartered in the Chicago area. The actual operating carrier for the flight is Mesa, who were originally headquartered in Albuquerque, although I believe that they are now headquartered in Phoenix.
I was born in, and lived in Albuquerque until I was out of College at 23. Since then I've lived in the Chicago area most of the time. In 1995, however, I was on an extended four month business trip to Phoenix, and in 1997 and 1998 I lived in San Diego for about 14 months.
(I had to set the "lived in" at 3 months since I've spent 6 weeks in Seattle and Hawaii, but the flight doesn't touch any airlines headquartered in either of those areas).