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Air travel is a form oftravel in vehicles such asairplanes,jet aircraft,helicopters,hot air balloons,blimps,gliders,hang gliders,parachutes, or anything else that can sustainflight.[1] Use of air travel began vastly increasing in the 1930s: the number of Americans flying went from about 6,000 in 1930 to 450,000 by 1934 and to 1.2 million by 1938. It has continued to greatly increase in recent decades, doubling worldwide between the mid-1980s and the year 2000.[2] Modern air travel is much safer than road travel.
Air travel are separated into two general classifications:national/domestic andinternational flights. Flights from one point to another within the same country are domestic flights. Flights from a point in one country to a point within a different country are international flights. Travelers can use domestic or international flights in either private or public travel.
Travel class on an airplane is usually split into a two, three or four class model service. U.S. domestic flights usually have two classes:economy class and a domestic first class partitioned intocabins. International flights may have up to four classes:economy class;premium economy;business class or club class; andfirst class.
Most air travel starts and ends at a commercialairport. The typical procedure ischeck-in;border control;airport security baggage and passenger check before entering the gate;boarding;flying; and pick-up of luggage and – limited to international flights – another border control at the host country'sborder. Most passengers must go through these steps when flying with a commercial airline.[3]
For longer journeys, air travel may consist of several flights with alayover in between. The number of layovers often depends on the number ofhub airports the journey is routed through.
Airlines rely either on thepoint-to-point model or thespoke-and-hub model to operate flights in between airports. The point-to-point model, often used by low-cost carriers such as Southwest,[4] relies on scheduling flights directly between destination airports. The spoke-and-hub model, used by carriers such as American[5] and Delta,[6] relies on scheduling flights to and from hub airports. The hub-and-spoke model allows airlines to connect more destinations and provide more frequent routes, while the point-to-point system allows airlines to avoid layovers and have more cost effective operations.[7]
Modern aircraft consume less fuel per person and mile traveled than cars when fully booked.[8] However, the distances traveled are often significantly larger and will not replace car travel but instead add to it, and not every flight is booked out.
Instead, the scheduled flights are predominant, resulting in a far worsefuel efficiency.[9][10][11]According to theATAG, flights produced 781 million tonnes (769 million long tons) of thegreenhouse gas CO2 in 2015 globally, as compared to an estimated total of 36 billion tonnes (35 billion long tons) anthropogenic CO2.[12]Carbon offset is often proposed as solution to mitigate the CO2 emissions of flying. There are many NGOs that offer to compensate CO2 emissions by advancing clean renewable energy, reducing energy consumption and capturing already released carbon in trees or other plants.[13] However, carbon offsetting is a very controversial topic as it only tries to mitigate what has already been emitted.[14]
Modern air travel is significantly safer than road travel.[15] In 2008 in the United States, there were 1.27 fatalities per 100 million road vehicle miles, compared to no fatalities and almost zero accidents per million flying miles.[15] There were more than five million driving accidents, compared to 20 accidents in flying.[15] Travelers may perceive planes to be more dangerous as they do not allow individual control and because plane crashes are more catastrophic events (theavailability bias).[15]
Deep vein thrombosis (DVT) is the third-most common vascular disease, next to stroke and heart attack. It is estimated that DVT affects one in 5,000 travelers on long flights.[16][17] Risk increases with exposure to more flights within a short time frame and with increasing duration of flights.[17]
During flight, the aircraftcabin pressure is usually maintained at the equivalent of 6,000–8,000 ft (1,800–2,400 m) above sea level. Most healthy travelers will not notice any effects. However, for travelers with cardiopulmonary diseases (especially those who normally require supplemental oxygen), cerebrovascular disease, anemia, or sickle cell disease, conditions in an aircraft can exacerbate underlying medical conditions. Aircraft cabin air is typically dry, usually 10%–20% humidity, which can cause dryness of the mucous membranes of the eyes and airways.[18]
A large passenger jet may consume five gallons of fuel per mile traveled. Is it possible, then, that planes are more efficient than cars?
Almost eight times as many passenger miles are traveled by car as by plane, but passenger car travel only accounts for 3 to 4 times as muchgreenhouse gas emission.
if we focus just on the impact over the next five years, then planes currently account for moreglobal warming than all the cars on the world's roads – a stark reversal of the usual comparison. Per passenger mile, things are even more marked: flying turns out to be on average 50 times worse than driving in terms of a five-year warming impact.
Media related toAir travel at Wikimedia Commons
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