code: function airPriceRspPassengersPerReservation(obj) {
    const data = this.mergeLeafRecursive(obj, 'air:AirPriceRsp')['air:AirPriceRsp'];
  
    const priceResult = data['air:AirPriceResult'];
    const prices = priceResult['air:AirPricingSolution'];
    const priceKeys = Object.keys(prices);
  
    const pricing = prices[priceKeys[0]]['air:AirPricingInfo'];
  
    return Object.keys(pricing)
      .reduce((acc, right) => ({
        ...acc,
        [right]: countHistogram(pricing[right]['air:PassengerType']),
      }), {});
  }
docs: /*
  returns keys of reservations (AirPricingInfos) with their corresponding passenger
  category types and counts for an AirPricingSolution
  
  NOTE: uses non-parsed input