ample(DOMESTIC_FLIGHTS);
  var splitOrigin = origin.replace(/(\s\()|(\))/g, '_').split('_');
  var cityOrigin = splitOrigin[0];
  var airportOrigin = splitOrigin[1];
  var userOrigin = core.sample([cityOrigin, airportOrigin]);

  var destination = core.sample(DOMESTIC_FLIGHTS);
  var splitDesination = destination.replace(/(\s\()|(\))/g, '_').split('_');
  var cityDesination = splitDesination[0];
  var airportDesination = splitDesination[1];
  var userDestination = core.sample([cityDesination, airportDesinat