31

They do have temporary liveries. This is very common in wet lease operators, where an aircraft is flown for an airline during a peak period or when their planes are down for maintenance. Airlines want customers to feel they are getting the brand-name product they are paying for; they don't want customers to board a generic white jet. An airplane will be ...


24

Here are some options for flying in an environmentally friendly way: Use an electric trainer: Since last year the all electric trainer aircraft Pipistrel Alpha Electro has FAA certification. Assuming the batteries are charged with renewable energy, this would mean no greenhouse gas emissions at all (excluding manufacturing). It will probably still take some ...


17

I can give you two theories. One is it's a very very mild case of "overcontrolling" of the autopilot roll servo as it chases a perfectly wings level condition and continuously applies a teeny bit too much left, ooops, then a teeny bit too much right, oops, and back and forth. The aileron control circuit is cables running to hydraulics at the ailerons, ...


15

By using as much simulator time as possible.


13

The time needed to apply and remove the advertisements would cost too much money. As long as the aircraft is on the ground, it cannot earn revenue. Better to forgo the small profits from ads for larger profits from operating the aircraft.


10

The ability to restart production depends on: is the tooling still available? Aircraft production uses giant jigs for production of the fuselage and wings. Sometimes these are stored when production ends (I've been in a hangar full of stored Airbus jigs), but sometimes they are scrapped. is production space available? An A380 needs lots of space in the ...


10

Mainly because winding down airline business will turn it into a sudden and from there on increasing loss. Airline operation nowadays is calculated in most cases toward a rather high plane utilization. Even more so on low cost enterprises. Sometimes even 10% less passengers may turn a profitable flight into a loss. Airlines depend on filling up flights - ...


9

Operationally speaking, this may come as a surprise, but it's not the range of the ER, rather the additional exits and flat bulkhead, which allow more seats (note: Lion Air was the launch customer of the -900ER). Exits: even if there is room for more passengers, a limiting feature is typically the exits. More exits, more passengers can evacuate in the same ...


9

I am basing the following calculations on the excellent answer by Peter Kämpf to this question: How much of an improvement would a 1% weight decrease on an airplane be to the industry?. We can approximate the fuel usage with the Breguet equation $$ m_\mathrm{TO} = m_\mathrm{Landing} \cdot \exp \left( \frac{R \cdot g \cdot b_f}{v \cdot L/D} \right) , $$ ...


8

Learnt to fly a solar powered hot air balloon The UK's International Balloon Fiesta in Bristol is a celebration of all things hot air ballooning, but this year it's taken a big stride into the future. August 6th saw the maiden public flight of the world's first hybrid hot air balloon, which flies by heating regular air from the sun alone.Source In theory,...


8

1) For a typical urban bus, that plastic foil has to stay on at maybe a max of around 60 mph. For a commercial jet, it'd have to stay on at 600 mph. And suppose it starts ripping off and gets tangled in the elevator... 2) You could repaint the plane at a cost of $50-200K How much does it cost to give an airliner a fresh coat of paint? but the ad would ...


6

Building upon jamesqf answer, I'd like to add: 3) The number of people seeing bus on the streets while moving between stops could be simplified as sum of traffic size + population working and living along its route. For every bus you get a very rough estimate of a thousand potential advertisement targets every minute. And who sees the plane? Only its ...


6

There are lots of reasons flights may not take a direct route, some are but not limited to: It's just the route ATC assigned (for whatever reason they see fit) There is an active military operations area or live firing area they are avoiding, these are not always "active" and may be avoided only sometimes. Some kind of natural event on the ground, wildfire,...


6

When you buy an airline ticket, you are buying a promise that at some future date there will be a seat on a plane for you to make your journey. If you have any reason to doubt whether that promise will be fulfilled, the rational thing to do is buy your ticket from a different airline. That is fundamentally different from many other commercial transactions, ...


6

A330-900neo A350-900 Seating 287–440 325 / 173 (ULR) MTOW 251 t 280 t OEW 137 t 137 t Unit cost US$296.4 M US$317.4 M Thrust/eng 324 kN 375 kN The A330 having fewer seats means a bigger chance of high utilization on any given flight (or having high-density small seats for shorter ...


6

The answers by Bianfable are pretty good. I'd add one more option: Use a powered glider. There are gliders with a small engine, electric or otherwise. Some look like propeller planes with glider wings, some have a much smaller engine and a retractable or foldable propeller. My favourite example is this one. These can take off under their own power, which is ...


5

The answer is pretty simple. A foot-launched glider (paraglider, hang-glider or ultralight) launched from a hill has zero emissions from the flight itself. It doesn't get more environmentally friendly than that!


5

Two worlds There are two elements constraining propeller use: The thrust we can get from a free propeller is lower than from a ducted fan at the same airspeed. Propeller efficiency quickly decreases with Mach number. Propeller performance vs speed. Source For these reasons fans are the natural choice for large and fast aircraft, and propellers for slower ...


4

There are some all-composite business jets, like the newest Bombardier Learjet. The design choice is about trade-offs in manufacturing: supply chain, number to be built, available tools and workers, legal certification (old methods are considered proven so require far less testing data), existing techniques, cost/percentage of build flaws, market price of ...


4

The C-Series has a carbon wing box. The fuselage is aluminum but is a newer fairly exotic aluminum lithium alloy that is a bit lighter than 2024. The decision to go with aluminum for the fuselage was mostly development and manufacturing cost (a fuselage requires a massive autoclave and it's development is fairly high risk the first time around) and ease of ...


4

They have been using temporary liveries for decades. Rock group Yes famously had one produced on film for their US tour in 197x and half way across the Atlantic it started peeling off and flapping towards one of the engines. YouTube for Rick Wakeman telling this story as he does it so well in his inimitable style


3

"which is more environmentally friendly, learning in a glider or learning in a single engine prop (Piper Tomahawk, Cessna and the like)?" I think you can combine the two. Glider for learning basic stuff in the airport environment and nearby (launching however the local method is, in my area that seems to be tow plane), and then small engine (100 HP) for the ...


3

The primary source of pollution from single engine propeller airplanes is the avgas used as fuel. Avgas is typically gasoline with tetraethyllead (TEL), a lead-containing additive used to reduce engine knock. The most environmentally friendly way to learn to fly, short of using a fully electric airplane, is to use an engine which supports unleaded automotive ...


3

It's pretty clear that operators of the 767-400ER knew what they were doing when they selected that aircraft. Only United and Delta bought them and they are still in service even as older 767 models are being retired. The 764s have proven to be a good value proposition even though it did not sell well and is a unique bridge between smaller and older 767 ...


3

A Real-World example: On a typical 3,551 NM airways distance flight a 365,000 lbs 767-300ER will take 08:40 and 92,300 lbs of fuel to get there with 216 pax and baggage (no cargo). The flight took longer due to 51 kts of head wind that turned the 3,551 NM into a 3,973 NM air miles (ESAD) flight. A 424,000 lbs 787-8 will do the same mission in 07:56 and use ...


3

What you're seeking is already a metric in aviation, it's called block hour. This typically measures the time from doors closing to doors opening, so taxi time is included. Hours flown is another metric. Planestats.com parses the statistics for the US from the DOT's website, and presents it nicely (I'm unaffiliated with that website – it was a lot easier to ...


2

In both examples, the aircraft was crossing the direct path between origin and destination, sometimes even flying perpendicular to the direct line. It would take more than one obstacle (like severe weather) to explain these patterns. It is very likely that the pilots were deliberately delaying their arrival with respect to traffic congestion at the ...


2

Depends on your definition of "fly". If you simply mean flying a plane-like object around in they sky, the fuel spent on a glider tow might only be 5-10 minutes worth, and on a good day you can stay up practicing your technique for hours. Your up-time-to-fuel ratio can pretty low, though I can't say the environmental impact of the manufacture of the two ...


2

A significant part of the environmental cost of the airplane is building it in the first place. That becomes relevant in a crash. A gentle crash saves the airframe, a rough crash makes you buy another airplane. Therefore, glider training is an environmental win, because it makes you better trained to gracefully recover from an engine-out situation, ...


2

This depends - among others - on the size and speed of the airplane, as well as the total trip duration. As a rule of thumb (based on fuel consumption data of a major airline), I've been working with 4 to 5% per hour of flight time (for jets). Yielding some 40 to 50 extra kgs of fuel for a trip of 10 hours, that is in accordance with the calculation done by @...


Only top voted, non community-wiki answers of a minimum length are eligible