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Old Jan 6, 19, 2:15 pm
  #9  
canadiancow
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Join Date: Sep 2012
Location: SFO
Programs: AC SE MM, Bonvoy Tit, HH Diamond, Hyatt Glob, Accor Gold, UA Silver
Posts: 34,706
This happened a lot with AC when they rolled out premium economy, and still happens to some extent. The cabins' inventories are managed differently.

Just this morning I was looking at a UA flight that was Z9 P0 Yx Bx M0. Z was a couple dollars more than B. If there had been P space, it would have been cheaper.

On AC, between the three cabins, I've seen situations where prices are completely inverted (Y $1500, PY $1300, J $1200), and every combination of absurdity. Excluding mistake fares, it's usually because of something like J9 P9 O9 A5 R0 Y3 B0.
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