The cost you add to a flight – yes, you.
The April 2015 edition of National Geographic includes a very nice short article which draws on the work of two MIT aeronautical engineers. The article to me is a very nice mix of explaining why airlines charge more for more weight (of bags usually, but some airlines are considering weight of passengers too), and how we as passengers can reduce CO2 emissions as we fly.
For many years now, low-cost carriers in particular have charged more for checked in bags. They also step-up the charges as bags get heavier. The key reason for this is to reduce ground-handling time – less checked bags, less baggage handling, faster turnaround, all of which reduce cost or increase revenue. But, as the National Geographic article also points out, more weight equals more fuel consumption and higher fuel cost. The MIT engineers used a Boeing 737-800 (as used by Ryanair) at 75% capacity as a model to calculate how much extra fuel cost various passenger items incur over a year. A 25kg suitcase increases costs by $3,267 per annum, a 1okg carry on $980, a laptop $291 and a full-bladder $29 – among other examples. Ryanair currently have 303 aircraft (per their website), so taking just the costs I quote, this is $4,567 per passenger per year x 190 seats x 303 aircraft, this equate to $262,922,190 – and that’s a big potential cost saving. I can already see Ryanair’s next advert 🙂
There are two points to take from the above. It is obvious that airlines may charge more for weighty items as these drive fuel costs up. The second point is look how much cost we could save the environment by taking even small steps like taking a pee before boarding – $29 x 190 seats x 303 = $1,669,530 worth of fuel. This is just one airline, and I have no idea how much CO2 emissions are reduced by, but as Tesco say “every little counts”.