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Thread: Same flight number going and returning?
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Old Aug 12, 2021 | 7:47 pm
  #35  
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Originally Posted by kale73
I know regulators currently limit flight numbers to 4 digits but is there any valid reason prohibiting them from going to 5? Adding a single digit would yield a tenfold increase in available numbers.
Most likely legacy ATC and reservation/ticket systems. Just like Y2K, these things require massive amounts of work to fix/validate.
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