Providing a comprehensive overview of all Airbus aircraft ever built would be quite extensive, but I can offer a brief summary:

Airbus A300: Airbus' first aircraft, introduced in the 1970s. It was a wide-body twin-engine jetliner designed for medium to long-range flights.

Airbus A310: A shorter-range version of the A300, designed for medium-haul flights. It shared many similarities with its predecessor.

Airbus A320 Family: Introduced in the late 1980s, the A320 family includes the A318, A319, A320, and A321. These are single-aisle aircraft known for their fly-by-wire technology and fuel efficiency.

Airbus A330: Introduced in the 1990s, the A330 is a wide-body twin-engine jetliner designed for medium to long-range flights. It has several variants, including the A330-200 and the larger A330-300.

Airbus A340: Also introduced in the 1990s, the A340 is a four-engine wide-body aircraft designed for long-haul flights. It was eventually phased out in favor of more fuel-efficient twin-engine models.

Airbus A380: Introduced in the 2000s, the A380 is the world's largest passenger aircraft, capable of carrying over 800 passengers in a single-class configuration. It's a double-deck, wide-body aircraft often used for high-density routes.

Airbus A350: Introduced in the 2010s, the A350 is a long-range, twin-engine wide-body aircraft designed to compete with the Boeing 787 Dreamliner and 777 series. It boasts advanced aerodynamics and composite materials for fuel efficiency.

Airbus Beluga: Not a passenger aircraft, but worth mentioning, the Airbus Beluga is a freighter aircraft used by Airbus to transport oversized aircraft components between its manufacturing facilities.

Airbus A220: Formerly known as the Bombardier CSeries, is a family of narrow-body, twin-engine jet airliners designed for the regional and medium-range market segments, offering fuel efficiency and passenger comfort.

Airbus A400M: Versatile military transport aircraft capable of carrying heavy cargo and troops, featuring advanced capabilities for tactical and strategic airlift missions.

The Concorde: Developed jointly by British Aircraft Corporation and Aérospatiale of France, represented a pinnacle of aviation achievement during its operational years from 1976 to 2003. With support from Airbus Industrie, the European consortium that later became Airbus, the Concorde showcased Europe's prowess in aerospace technology and innovation. Despite its ultimate retirement due to economic and safety concerns, the Concorde remains a symbol of collaboration and engineering excellence between British and French aerospace industries, with Airbus continuing to carry forward this legacy in modern aviation endeavors.

Boeing's commercial aircraft lineup spans a wide spectrum of models, ranging from time-tested classics to cutting-edge innovations. Let's explore both the old and new aircraft in Boeing's portfolio:

Old Aircraft:

Boeing 707: Introduced in the late 1950s, the Boeing 707 was the company's first commercial jetliner and played a crucial role in revolutionizing air travel by making it faster, safer, and more accessible.

Boeing 727: The Boeing 727, introduced in the early 1960s, was a trijet narrow-body airliner known for its versatility and ability to operate from short runways. It served as a workhorse for many airlines worldwide for decades.

Boeing 737 Classic Series: The classic series of the Boeing 737, including the 737-300, 737-400, and 737-500, were introduced in the 1980s and represented significant advancements in efficiency and passenger comfort over earlier models.

Boeing 747 Classic Series: The original Boeing 747, often referred to as the "jumbo jet," debuted in the late 1960s and forever changed long-haul air travel with its unprecedented capacity and range.

Boeing 757 and 767: Introduced in the 1980s, these twin-engine aircraft filled crucial niches in the market. The 757 was prized for its versatility on both short and medium-haul routes, while the 767 served as a highly efficient wide-body option for medium to long-haul flights.

New Aircraft:

Boeing 737 MAX: The latest iteration of the iconic 737 series, the 737 MAX incorporates advanced aerodynamics and fuel-efficient engines to offer improved performance and reduced operating costs. Despite initial setbacks due to safety concerns, Boeing has worked to address these issues and resume deliveries.

Boeing 777X: The Boeing 777X represents the next generation of the highly successful 777 series. Featuring composite wings and powerful engines, the 777X promises increased efficiency and passenger comfort, with variants including the 777-8 and 777-9.

Boeing 787 Dreamliner: Launched in the late 2000s, the Boeing 787 Dreamliner is a game-changer in terms of design, materials, and passenger experience. Its extensive use of composite materials results in a lighter and more fuel-efficient aircraft, while features such as larger windows and improved cabin pressure enhance passenger comfort.

Boeing 737NG: While technically not new, the Next Generation (NG) series of the Boeing 737, including the 737-600, 737-700, 737-800, and 737-900, represents a significant advancement over previous models in terms of range, fuel efficiency, and onboard technology.

Boeing's commercial aircraft portfolio showcases a blend of tradition and innovation, with a rich history of iconic aircraft alongside cutting-edge designs aimed at shaping the future of air travel. Despite challenges and setbacks, Boeing continues to push the boundaries of what is possible in commercial aviation, ensuring its position as a leader in the industry.

McDonnell Douglas, a prominent aerospace manufacturer, had a notable presence in the commercial aircraft industry before it merged with Boeing in 1997. Throughout its history, McDonnell Douglas produced several successful commercial aircraft models, each contributing to the company's legacy in aviation.

DC-8: The DC-8 was McDonnell Douglas's first commercial jetliner, introduced in the late 1950s. It was designed to compete with other early jetliners like the Boeing 707 and the Convair 880. The DC-8 had various versions with different ranges and capacities, making it a versatile choice for airlines around the world.

DC-9: Introduced in the 1960s, the DC-9 was a short-to-medium-range jetliner known for its efficiency and reliability. It featured a twin-engine configuration and a distinctive T-tail design. The DC-9 family expanded to include several variants, including the popular MD-80 series.

DC-10: Launched in the early 1970s, the DC-10 was McDonnell Douglas's first wide-body jetliner. It was designed to compete with the Boeing 747 and the Lockheed L-1011 TriStar. The DC-10 had a tri-jet configuration, with engines mounted on the wings and the tail. Despite facing initial challenges, the DC-10 became a successful aircraft and served various airlines worldwide.

MD-11: Building upon the DC-10's success, McDonnell Douglas introduced the MD-11 in the early 1990s. The MD-11 featured modernized systems and improved aerodynamics compared to its predecessor. It was marketed as a more fuel-efficient and technologically advanced option for airlines operating long-haul routes. However, the MD-11 faced stiff competition from other wide-body aircraft like the Boeing 777, leading to relatively fewer sales.

Throughout their operational history, McDonnell Douglas commercial aircraft were known for their robust construction, reliability, and distinctive design features. However, as the aviation industry evolved, McDonnell Douglas faced increasing competition from rivals like Boeing and Airbus, leading to the company's eventual merger with Boeing in 1997. Today, many McDonnell Douglas aircraft remain in service with various airlines, though newer generations of aircraft have largely replaced them in commercial fleets. Nonetheless, the legacy of McDonnell Douglas's commercial aircraft continues to influence modern aviation design and technology.