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Boeing planned for the aircraft to offer the lowest fuel burn per passenger-kilometer of any narrow-body airliner.
Since yield is expressed as revenue per passenger-kilometer, this effectively assumes that passengers pay the same fare per kilometer in every market.
Although airlines have reduced fuel consumption by 1-2% per passenger-kilometer in the last decade and noise emission from aircraft has declined significantly, but the overall environmental impact of civil aviation has increased due to buoyant growth in traffic.
The two causal variables that have the greatest effect on the forecast traffic growth are the Canadian Gross Domestic Product (GDP) and the average air fares, reflected in the forecast assumptions by the real airline yield (the average passenger revenue per passenger-kilometer).