Suppose

• Site descriptions for each airline’s flights

  • United($Source, $Dest, FN, Time) => …
  • Alaska($Source, $Dest, FN, Time) => ...
  • Southwest($Source, $Dest, FN, Time) => ...
  • SABRE($Source, $Dest, FN, Time) => ...
  • ...

• Query: find all flights...

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