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Thread: Sequence Numbers: What are they, how are they used & other questions?
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Old Jun 29, 2015 | 9:00 pm
  #85  
docbert
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Originally Posted by dank0014
IIRC, it is the check in number based upon the flight number. Meaning your flight may have a similar flight number that is operating earlier in the day. Could be wrong though
This is correct. Specifically, flight number and date as a pair.

As UA frequently use the same number for 2 or even 3 or more flights per day, you could be the first to check-in for your specific flight, and still be closer to 500 than 1.
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