Why Planes Don't Fly Faster

Commercial flights are scheduled to take longer than they did in the 1960s. An American Airlines timetable from 1967 listed Flight 3 from New York’s JFK Airport to Los Angeles International Airport at 5 hours and 43 minutes.

American Airlines Flight 3 gained 44 minutes of scheduled travel time. In 1967, the daily flight departed JFK at noon and arrived in Los Angeles at 2:43 p.m., accounting for the three-hour time difference. At the time of the video, the same flight number still departed at noon but was scheduled to arrive at 3:27 p.m.

Longer schedules do not necessarily mean slower aircraft. Actual time spent flying has remained broadly similar, but airlines have increased scheduled journey times to account for airport congestion, delays, and operational disruptions.

Commercial aviation has made little progress in reducing travel times despite decades of technological development. The video contrasts aircraft speeds in 1967, before the Moon landing, with modern aviation to illustrate how limited the improvement has been.

Aircraft engine design largely determines the speeds at which planes operate efficiently. The three main engine categories discussed are turboprops, turbofans, and turbojets, each suited to a different operating speed.

Turboprop engines are economical but relatively slow. Almost all their thrust comes from the propeller, with exhaust contributing less than 10%. Their relatively low purchase and operating costs make them suitable for smaller commuter aircraft.

Turboprops are most efficient at approximately 325–375 mph. Beyond that range, the video identifies turbofan engines as the more efficient choice.

Turbofans power most commercial jet aircraft. A large front-mounted fan accelerates incoming air, directing some through the engine core and combustion chamber while the remainder bypasses the core. Their efficient operating range is described as approximately 400–620 mph.

Turbojets enable supersonic flight at substantially higher fuel costs. Unlike turbofans, turbojets direct all incoming air through the engine core, with no bypass airflow. The video places their most efficient operating speeds around 1,300–1,400 mph.

The bypass ratio is a central measure of jet-engine fuel efficiency. It compares the amount of air traveling around the engine core with the amount passing through it. Higher ratios generally improve efficiency because accelerating more air with a larger fan requires less additional energy than processing more air through the core.

Increasing fan size is an important method of improving engine efficiency. The explanation emphasizes that spinning a larger fan requires relatively little additional energy compared with the fuel needed to accelerate more air through the combustion process.

General Electric's GEnx engine demonstrates modern high-bypass efficiency. Used on the Boeing 787 Dreamliner and Boeing 747-8i, it has a bypass ratio of 10:1, meaning ten times as much air bypasses the engine core as passes through it.

The CFM International CFM56 has a bypass ratio of 5.9:1. Although considered a high-bypass engine, its smaller fan relative to the core makes it less efficient than the newer GEnx in the video's comparison.

The Pratt & Whitney JT8D has a bypass ratio of just 0.96:1. Its substantially lower bypass ratio makes it less fuel-efficient than the GEnx or CFM56, illustrating the gains achieved through newer engine designs.

Concorde used the Rolls-Royce/Snecma Olympus 593 turbojet, which had a bypass ratio of 0:1. With no bypass airflow, the engine consumed substantially more fuel than the turbofan examples, including the older JT8D.

Concorde burned approximately 46.85 pounds of fuel per mile, compared with 18.7 pounds for the Boeing 787 Dreamliner. The comparison demonstrates the fuel penalty associated with Concorde's supersonic propulsion system.

Concorde's small passenger capacity made its fuel consumption especially expensive per traveler. Concorde accommodated approximately 100 passengers, compared with 291 on the Dreamliner used in the comparison.

Concorde achieved approximately 14 passenger-miles per gallon, compared with 104 for the Dreamliner. The video's figures indicate that the Dreamliner was more than seven times as fuel-efficient per passenger under the comparison presented.

Air France and British Airways were the only two airlines to operate Concorde commercially. Both ultimately found its operating economics unsustainable.

Fewer than one-third of Concorde's seats were occupied by paying customers, according to the video. Other passengers traveled using frequent-flyer miles or upgrades from first class on conventional flights, limiting the revenue available to cover its high operating costs.

A one-way Concorde ticket from London to New York cost at least $7,500 in inflation-adjusted dollars. Passengers paid this premium to complete the Atlantic crossing in approximately three hours.

Concorde's seating offered relatively little luxury for its extraordinary price. Despite the premium fare, its seats were cramped and described as not substantially different from modern economy-class seating.

Concorde initially competed against conventional first-class seats that offered limited sleeping comfort. When Concorde began operating, first-class cabins generally provided larger seats rather than fully horizontal beds, strengthening the appeal of a shorter flight.

Improvements in conventional first-class seating weakened Concorde's advantage. By the time Concorde retired in 2003, competing airlines offered fully flat beds, making longer flights considerably more comfortable.

British Airways introduced the first fully flat business-class seat in 2000. Passengers could cross the Atlantic sleeping horizontally for significantly less money than a Concorde ticket.

Travelers increasingly preferred seven comfortable hours to three cramped hours. The development of flat-bed premium cabins changed the comparison from speed alone to the overall quality and usefulness of the journey.

Overnight flights from the United States to Europe reduced the practical value of supersonic travel. Business travelers could depart in the evening, sleep during the crossing, and arrive in Europe the following morning, effectively using their normal sleeping hours for transportation.

Concorde lost both its luxury advantage and part of its time-saving appeal. Its original proposition of providing an exceptionally efficient Atlantic crossing for business travelers became less persuasive once conventional airlines offered comfortable overnight travel.

Concorde's final commercial flight took place on October 24, 2003. Its retirement ended the era of scheduled commercial supersonic passenger service described in the video.

Airlines prioritize fuel efficiency over maximum speed. The video argues that faster travel mainly benefits passengers as a selling point, while airlines have stronger financial incentives to minimize operating costs.

Aircraft acquisition costs represent only part of an airline's operating expenses. Fuel expenditure is significant enough that flying faster to increase aircraft utilization does not automatically improve profitability.

Aircraft lifespans are commonly measured in flight cycles. A cycle consists of one takeoff and one landing, making the number of flights an important measure of an aircraft's useful life.

The Boeing 787 Dreamliner is described as having a design life of 44,000 flight cycles. The video gives a list price of $224.6 million, while noting that airlines frequently negotiate actual purchase prices below the advertised figure.

The Dreamliner's listed purchase price works out to slightly more than $5,000 per flight across 44,000 cycles. This calculation distributes the aircraft's advertised acquisition cost across its stated design life.

Fuel for a New York–London flight costs more than $15,000 in the video's example. That exceeds the Dreamliner's calculated aircraft acquisition cost per flight by approximately three times, illustrating why fuel efficiency receives so much attention.

Typical fuel-efficient commercial jet speeds are approximately 500–550 mph. Airlines generally operate around these speeds rather than pushing aircraft toward their maximum capabilities.

Commercial jets generally fly well below the speed of sound for aerodynamic and economic reasons. The video uses approximately 767 mph as the speed of sound to illustrate the substantial gap between ordinary cruising speeds and supersonic travel.

The transonic range extends approximately from Mach 0.8 to Mach 1.2. Within this range, airflow around an aircraft contains both subsonic and supersonic regions, creating complicated aerodynamic conditions.

Shock waves begin appearing as parts of the airflow reach supersonic speeds. According to the explanation, this increases drag sharply and can affect aircraft stability.

Operating close to the speed of sound creates significant aerodynamic challenges. The video argues that aircraft should generally operate comfortably below or above the transonic range rather than attempting to cruise through it.

Shock waves around transonic aircraft can sometimes appear in photographs or video. The narrator describes thin lines that resemble scratches on a camera lens but are actually associated with localized supersonic airflow.

The video states that flying between Mach 0.8 and Mach 1.2 can require more fuel than flying above Mach 1.2. It attributes this to the substantial aerodynamic resistance encountered in the transonic region.

The video identifies approximately 613.8 mph as the commercially viable speed limit for subsonic jets. This figure is presented as a consequence of increasing drag and deteriorating efficiency as aircraft approach the transonic region.

Supersonic aircraft offer dramatic reductions in journey time but face difficult operating economics. Concorde demonstrated that crossing the Atlantic in approximately three hours was technically achievable, but the costs prevented that service from becoming broadly accessible.

Affordable transatlantic flights are presented as a more meaningful achievement than supersonic travel. The narrator argues that transporting passengers across the Atlantic for $100–$200 while maintaining airline profitability would provide greater practical value.

Modern aircraft speeds already make extremely long-distance travel possible within approximately 24 hours. The video argues that existing aviation technology is fast enough to satisfy the travel needs of most passengers.

Ticket prices are a greater barrier to international travel than flight duration for most people. The explanation distinguishes travelers who can afford to pay substantial premiums to save hours from those whose ability to travel depends primarily on price.

Aircraft manufacturers and airlines are therefore expected to prioritize lower travel costs rather than higher speeds. Improvements in fuel efficiency, aircraft economics, and operating costs are presented as more commercially valuable than another major increase in cruising speed.

The central economic trade-off is between saving time and making travel affordable. Concorde catered to a limited market willing to pay heavily for speed, while conventional commercial aviation serves a much larger market whose demand is more sensitive to ticket prices.