Originally Posted by norse_aztec
CX seems to have a policy of overselling J and then bumping premium pax to F as required. This seems to be different than SQ for example, who requires purchase of a F ticket should J become booked.
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SQ does op-up on the odd occasion... it's just rare as they have better revenue control management than CX.
And no, SQ will not make you pay the fare difference...
They used to just leave you behind and put you on the next flight rather than upgrade you..