Isn't there more to this number? While I usually check-in close to the 24 hour mark. However, this past weekend in Houston I was not able to check-in until getting to the airport on Sunday (no computer and couldn't use airport kiosk the day before). I checked in around 6:20am for a 8:00am flight on a 764... I could have sworn my sequence number was in the 300's... how would that be?