Aerospace

How Does In-Flight Wi-Fi Really Work?

Most people always have this question in their minds. well here is an answer from Quora submitted by Derek Schatz.

There are two primary methods to enable a passenger Internet connection on an airplane: satellite and air-to-ground. I’ll talk about some of the key points on each of those, then talk about the in-cabin WiFi access point part.

Air-to-ground

As the name implies, signals go from the airplane directly to antennas on the ground
Uses a network of ground cell towers across the continental U.S. (therefore does not work over water). These towers’ cells are much larger than those of the typical cell towers used for phones.
Uses a version of CDMA, just like Verizon cell phones
Antennas are on the belly of the airplane, looks like a small fin
As the airplane flies, the connection hands off from one tower to the next just like your phone does when you’re driving. Users don’t notice any interruption.
Network infrastructure is much cheaper than satellite
Bandwidth for the newest generation system (ATG4) is up to 9.8 megabits per second (Mbps) per airplane (shared across all users). This is enough for email and casual web surfing, but would get quickly exhausted if people stream video – so this is usually blocked.
Gogo is the top provider of this type of service.
Installed on over 1,000 aircraft operating on domestic routes in the U.S., including Delta, American, Virgin America, and Alaska
Plans announced in late 2014 by Inmarsat to partner with Gogo on a hybrid ATG+satellite solution for Europe

Satellite

Unlike air-to-ground, signals from the airplane go into space to an orbiting satellite and then down to the ground. These satellites are usually in geostationary orbit, 22,300 miles up.
Three types offer different levels of performance (bands indicate specific transmission frequency ranges):
- L-band (e.g. Inmarsat Swift Broadband): pretty slow, max 422kbps per channel per airplane
- Ku-band (e.g. Panasonic, Global Eagle, and Gogo): tops out at around 20-40Mbps per airplane. Speeds depend on how many airplanes are in the satellite’s transponder “footprint” (aka spot beam)
- Ka-band (near future, satellites launching soon): promises even higher speeds
A modern satellite has dozens of transponders to support a large number of simultaneous connections, e.g. ships, airplanes, portable ground terminals
Leasing transponders (antennas) on satellites is very expensive, so this cost is usually passed on to the airline and the passengers. But Jetblue offers it for free.
The airplane’s antenna is on the top of the fuselage, under a bubble-shaped radome
The only choice for trans-oceanic routes, and routes flying closer to the polar region (since you can’t put cell towers in the ocean)
Using satellites means a few hundred milliseconds more latencies since the data packets need to go 22,300 miles up to the satellite, then roughly 22,300 miles back down to the airplane. New constellations of low earth orbit (LEO) satellites providing lower latency high bandwidth connections are in development since 2015, e.g. by SpaceX.
Installed base not large yet but growing, targeted initially for routes between the U.S. and Europe
As the airplane flies, the antenna on the top of the plane is steered or electronically aimed to stay pointed at the correct transponder on the satellite up in orbit. For long-haul flights, there will likely be a handoff from one satellite to another when moving between coverage areas. This happens via coordination on the ground, and the airborne users may only notice a very brief hiccup. From the satellite’s viewpoint, it switches airplanes from one transponder to the next as it moves between the beams pointed at the ground.

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Aerospace

India is set to build a central command for the Air Traffic Control system, called ISHAN

Coutresy : Boeing planes

India’s air traffic growth has led to increased responsibilities for air traffic control. The Airports Authority of India (AAI) is considering centralizing air traffic control for aircraft, dividing the country into four regions. The goal is to consolidate India’s segmented airspace into a single entity to improve air traffic management (ATM) efficiency, safety, and smoothness.

Recently, the AAI invited expressions of interest to develop a detailed project report for the Indian Single Sky Harmonized Air Traffic Management (ISHAN) initiative in Nagpur. Under this plan, air traffic controllers in Nagpur would handle domestic flights flying above 25,000 feet, eliminating the need for coordination among controllers in different regions.

For domestic regional flights operating above 25,000 feet, control would shift to the central command in Nagpur. This consolidation aims to enhance airline operations, increase flight handling capacity, and reduce congestion and flight times for passengers.

Currently, the AAI provides ATM services over Indian airspace and adjoining oceanic areas, covering over 2.8 million square nautical miles. This airspace is divided into four flight information regions (FIRs) in Delhi, Mumbai, Kolkata, and Chennai, along with a sub-FIR in Guwahati.

FIRs are responsible for providing air traffic services, including weather information, visibility, and search and rescue assistance. The proposed unification under the ISHAN initiative aligns with the projected growth of the aviation industry, which anticipates a doubling of domestic passenger traffic by 2030.

Aerospace

Does AirAsia show interest in Comac aircraft in the future?

Courtesy : Tony Fernandes (Linked in Story)

Tony Fernandes, CEO of Capital A, operating as AirAsia Group, recently paid a visit to the facilities of COMAC on April 2, 2024, and was thoroughly impressed by what he witnessed.

C919 already securing nearly 1000 orders

COMAC, known for its homegrown aircraft, has launched two promising jets: the ARJ21 and the C919 aircraft. Both aircraft are gaining popularity in the Chinese market, with the C919 already securing nearly 1000 orders from various airlines.

Fernandes expressed his admiration for COMAC’s achievements in aircraft manufacturing, acknowledging the immense challenge it entails. His visit underscored the realization that AirAsia now has a viable third option when it comes to selecting aircraft for its fleet.

During his tour, Fernandes was delighted by the innovation and technology evident in COMAC’s aircraft production and the company’s commitment to long-term partnerships.

He noted that many Western companies have shifted away from prioritizing loyalty and customer service, opting instead for short-term gains and a narrow definition of success.

Last month, COMAC embarked on an international tour, showcasing demonstration flights to neighboring countries, particularly Indonesia and Malaysia. Fernandes believes that the positive impression left by COMAC during his visit opens up new opportunities for collaboration.

Fernandes emphasized COMAC’s remarkable achievements

The shared values of loyalty, customer service, and long-term vision align closely with AirAsia’s ethos, making collaboration with COMAC appealing. With a focus on innovation and excellence, both companies stand to benefit from a partnership grounded in trust and a shared commitment to success.

Indonesia and China have already collaborated in validating and maintaining the airworthiness of the ARJ21 aircraft, indicating a solid foundation for future partnerships.

In his statement, Fernandes emphasized COMAC’s remarkable achievements and genuine desire for long-term partnership, highlighting the absence of ego and a genuine willingness to succeed together. He marveled at COMAC’s fully automated, AI-driven factory, a testament to their dedication to innovation and efficiency.

Fernandes criticized Western firms for prioritizing short-term gains over loyalty, customer service, and long-term strategy, emphasizing the importance of understanding customers’ needs and collaborating to achieve success.

Aerospace

Indigo will soon launch Air Taxi Service in India

Image:Archer Aviation

InterGlobe Enterprises, the parent brand of IndiGo, is set to revolutionize travel in India with its upcoming air taxi service.

Scheduled for a potential launch in 2026, this innovative venture promises a seamless journey for passengers between two bustling hubs. Delhi and Gurgaon in Haryana. The forthcoming service is projected to revolutionize the daily commute, offering passengers a swift aerial journey covering the distance in a mere 7 minutes.

This remarkable efficiency contrasts starkly with the conventional 90-minute drive, underscoring the immense time-saving potential for commuters. The anticipated fare, ranging from Rs 2,000-3,000, makes this innovative mode of transport not only swift but also remarkably competitive in pricing.

At the heart of this ambitious endeavor lies a strategic partnership with Archer Aviation, a pioneer in electric vertical takeoff and landing (eVTOL) aircraft technology. Under this collaboration, Archer will supply 200 state-of-the-art eVTOL aircraft, representing an investment of US$ 1 billion. These cutting-edge aircraft, capable of accommodating up to four passengers alongside the pilot, epitomize the future of sustainable air travel.

Powered by six battery packs, Archer’s eVTOL aircraft boast rapid charging capabilities, enabling a swift turnaround between flights. With a charging time of just 30-40 minutes, these eco-friendly aircraft ensure minimal downtime, maximizing operational efficiency.

Similar services are anticipated to be introduced by the joint venture in Bengaluru and Mumbai as well. Nevertheless, the service rollout period has not yet been made public by the company. Next year, it is anticipated to get its certification. Following this, the company will start the certification procedure with the Directorate General of Civil Aviation (DGCA).