I've done a similar thing with Southwest Airline's check-in. They let people get seated based on the order in which they check in for their flight. So right before the 24 hour period began I would run a script that tried to check me in repeatedly until it succeeded. Usually got really good seats.

EDIT: to those asking for the source, it was just a bash script that I have probably lost. The GitHub linked in this subthread looks a lot better than what I had.