The same route, why is now the time to air navigation are longer than the 1970 's? -Passenger routes-IT information
In the past several years, achieved a major breakthrough and advances in aircraft technology. Aerodynamics, materials and designs have become more sophisticated. So why spend from one destination to another destination today time is longer than the 1970 's?
For example, direct flights from New York to Houston, Texas today takes 3 hours and 50 minutes. But according to the Business Insider reports, the same flight in 1973 and only needed 2 hours and 37 minutes.
In the United Kingdom there is also such a situation.
According to the United Kingdom, the Daily Telegraph reported, compared to mid-1990, and today the voyage from London to Edinburgh is an extra 10 minutes. And flew from Madrid to Barcelona was slower than in the past 20 minutes.
Business Insider believes that flights take longer mainly because of fuel costs.
Many airlines require the pilot to reduce speed to save money. After all, in 2002 from us $0.7 per gallon fuel price increases by the year 2012 of $3/gallon.
In 2008, Northwest Airlines said flights by speed of 532 miles per hour decreased from 542 miles per hour, the single flight from Paris to Minneapolis saved 162 gallons of fuel. Spin down to single voyage time of 8 minutes, but save the company nearly 300 pounds.
Northwest Airlines estimates after spin, flight from Los Angeles to Hawaii each year would save ￡ 300,000 spending.
United States Southwest also expects increase of 1-3 minutes per voyage, will save them ￡ 21 million of expenditure.
Budget carrier JetBlue said speed will save the company ￡ 8 million.
Existing civil aviation engineer who declined to be named explained that in fact some aircraft designed to fly more slowly as the starting point, so as to achieve the purpose of fuel.
He told the post's online travel channel: "new models such as the A330 in design than the 747s fly more slowly, using non-Mach 0.85 Mach 0.82, in order to achieve higher efficiency. Only slow down design of the Dreamliner--flying at Mach 0.85, sometimes to Mach 0.86, fuel consumption is low. But most airlines no longer allows pilots to accelerate flight to arrive, because the expenditure on fuel, arrived in the economic efficiency can be ignored – for example, long-distance flight to arrive, do a minute accelerated flight, losses can be up to 100 kilograms of fuel. ”
Of course there are other reasons-such as the Airways crowded and the weather.
The captain said: "path crowded with savings and the impact of weather-related delays to journey times comparable, this phenomenon is particularly evident in Europe. In some large flights of United Kingdom airports, particularly Heathrow and Gatwick Airport, after landing needs more time to slide and wait for parking bays. ”
Another industry insiders, who asked not to be named agreed that route congestion is the main reason.
He said: "I think the main reason is the sky really jam it up. For example, in 2016, ushered in air traffic in Europe and London, one of the largest summer, this record will break again in 2017. Now that route is congested M25 London ring road, in the air. ”
Some travel industry believe airlines in "fill the flight itinerary" artificially extended-they will arrive in time. Allow more time for flights arrived on time, even if the delay does occur.
Pere Suaru-Sanchez, Professor of air traffic management at Cranfield University said: "extension of time of arrival can be prevent flights because of the delay in a domino effect. This does not mean that flight time will be longer, but it gives a lot more flexibility, while also avoiding the emergence of widespread delays. ”
However, the "Cockpit Confidential," Patrick Smith, author of the book believe that flight time has been significantly improved.
He told the post's online travel channel: "(Business Insider) reported the phenomenon does exist in some routes, but it ignores the fact that direct flights--today far more than in the past. In the 60 's, if you want to fly from London to Bangkok, you take the 707 needs to stop 4 times. Now there are direct flights between most of the big cities in the world. From New York to Shanghai; from London to Beijing, from Sao Paulo to Paris, and so on. Long voyages often takes a few days before. Now the flights need only 12-14 hours. And that flights can reach around the world. ”
同样的航线，为何现在飞机航行时间要比1970年代还长？ - 客机,航线 - IT资讯
在过去的几十年中，飞机技术实现了重大的突破和进展。航空动力学、材料学和引擎设计都变得越来越精密。那么为什么今天从一个目的地到另一个目的地所花费的时间却比1970年代还要长？
举例而言，今天从纽约直飞德克萨斯州休斯敦需要3小时50分钟。但据Business Insider报道，同样的航程在1973年只需要2小时37分钟。
在英国同样存在这样的情况。
据英国《每日电讯报》报道，相较于1990年代中期，今日从伦敦飞往爱丁堡的航程要多耗费10分钟时间。而从马德里飞往巴塞罗那也比过去要慢20分钟。
Business Insider认为，航班耗时更长的主要原因在于燃料花销。
不少航空公司要求飞行员降低飞行速度以节省开支。毕竟，燃料的价格从2002年的0.7美元/加仑上涨到了2012年的3美元/加仑。
2008年，西北航空表示，通过将航班的时速由每小时542英里降至每小时532英里，由巴黎飞往明尼阿波利斯的单趟航班可以节省162加仑燃料。降速让单趟航程的时间增加了8分钟，但却为公司节省了将近300英镑。
西北航空估计，降速后，每年从洛杉矶飞往夏威夷的航班将节省30万英镑的开支。
美国西南航空也预计，每趟航程增加1到3分钟，将为他们节省2100万英镑的开支。
廉价航空公司JetBlue则表示，降速将为公司节省800万英镑。
一位不愿具名的在役民航机长解释称，事实上一些飞机在设计时就以飞得更慢为出发点，从而达到省油的目的。
他告诉邮报在线旅游频道：“诸如A330这样的新款机型在设计上比747s飞得更慢，采用0.82马赫而非0.85马赫，以实现更高的经济性。唯一没有采用减速设计的是梦幻客机——它的飞行时数是0.85马赫，有时会达到0.86马赫，燃料附加损耗也较低。但是绝大多数航空公司都不再允许飞行员加速飞行以求准时到达，因为相对于燃油开支，准点到达的经济效率可以忽略不计——打个比方，长途航班为了准时达到，做一分钟的加速飞行，耗损的燃料可达100千克。”
当然还有其他的原因——例如航路拥挤和天气。
这名机长表示：“航路拥挤与节省开支以及天气相关的延误对航程时间的影响等量齐观，这种现象在欧洲尤为明显。在一些航班众多的英国机场中，特别是希思罗机场和盖特威克机场，飞机着陆后需要更多的时间来进行滑行和等待停机位。”
另一位不愿具名的行业知情人士也认为航路拥堵是主要原因。
他说：“我认为主要原因是现在的天空实在太拥堵了。举例而言，2016年，欧洲和伦敦迎来了航空客流量最多的一个夏天，这个记录将在2017年被再次打破。现在的航路就像是空中拥堵的伦敦外环M25高速路。”
也有一些旅游业内人士认为是航空公司在“填充航班行程”——他们将抵达时间人为地延长了。这让航班有更加充足的时间准时到达，即使确实出现了延误的情况。
克兰菲尔德大学空中交通管理学教授Pere Suaru-Sanchez表示：“延长抵达时间可以防止航班因延误而出现的多米诺效应。这并不意味着航程时间必然会变长，但却能够给排期更多的弹性，同时也可以规避大面积延误现象的出现。”
尽管如此，“Cockpit Confidential”一书的作者Patrick Smith却认为飞行时间已经得到了显著的改观。
他告诉邮报在线旅游频道：“（Business Insider）报道的现象可能在部分航线上确实存在，但它忽略了一个事实——今日的直飞航班比过去要多得多。在60年代，你如果要从伦敦飞往曼谷，你乘坐707需要在中途停留4次。现在世界上绝大多数大城市之间都有直飞航班。从纽约到上海；从伦敦到北京；从圣保罗到巴黎，如此等等。以前远途航行往往需要耗费几天。现在这些航班只需要12至14小时。并且航班可以通达世界各地。”
