FlyerTalk Forums - View Single Post - What is the point of checking in 24 hours before a flight
Old Aug 7, 2016 | 9:24 pm
  #8  
MSPeconomist
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If there's some problem with your ticket or reservation, it's better to have one day rather than one hour to fix it before missing the flight.

Depending on the carrier's rules, checking in early gives you priority for upgrades or avoiding IDBs or involuntary downgrades. In some cases, you must check in to see your position on the upgrade list.
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