FlyerTalk Forums - View Single Post - What is the lowest F seat inventory that was available when your upgrade cleared?
Old Jan 30, 2010 | 3:27 pm
  #20  
UNITED959
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I once had a Y > C upgrade clear on SIN-NRT when C was booked to 52 (with only 49 seats in the cabin). I was #53, and was able to select my seat online before the flight.

I know this because a UA insider shared the information with me; we were both shocked!
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