slot-value pairs 限制条件
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Three years ago the No. 100 in rank had sales, profits and market value roughly half the size of BASF, which has the slot this year.
FORBES: As the World Turns
That's what is pushing up the value of its landing slots, so airlines are required to maximise profit from each slot, and that is best done by long-haul routes.
BBC: BA: long-haul and the short of it
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