FlyerTalk Forums - View Single Post - LHR-JFK-LHR showing A1 before and after VIP upgrade
Old Aug 24, 2019, 3:21 pm
  #6  
Dave Noble
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Join Date: Jan 2002
Posts: 44,572
A is not just used for upgrades , the family of 5 might have a purchased 1st class fare in A class

It is not particularly unusual for availability to become available after a seat is booked if the airline is happy to sell more seats in that class
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