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Operation Linebacker II
Operation Linebacker II, known as the Christmas Bombing, was a United States air campaign against North Vietnam in December 1972 that forced Hanoi back to peace talks.
Operation Looking Glass
Operation Looking Glass, also called the Airborne National Command Post, was Strategic Air Command's airborne nuclear command post, airborne around the clock from February 1961 to July 1990.
Operation Martyr Soleimani
Operation Martyr Soleimani, also reported as Operation Martyr Qasem Soleimani, was Iran's ballistic-missile attack of 8 January 2020 against Ayn al-Asad and Erbil in Iraq, its first direct strike on US forces.
Operation Menu
Operation Menu, also called the Secret Bombing of Cambodia, was a secret United States Air Force B-52 campaign against Communist base areas in Cambodia from March 1969 to May 1970.
Operation Northwoods
Operation Northwoods was a 1962 United States Joint Chiefs of Staff plan proposing staged incidents blamed on Cuba to justify invasion, rejected by the Kennedy administration.
Operation Opera
Operation Opera (Hebrew: מבצע אופרה), also known as Operation Babylon, was a surprise June 7, 1981 Israeli Air Force airstrike that destroyed Iraq's unfinished Osirak nuclear reactor southeast of Baghdad.
Operation Popeye
Operation Popeye, also known as Motorpool, was a classified US Air Force cloud-seeding program of the Vietnam War that seeded monsoon clouds over the Ho Chi Minh Trail from 1967 to 1972.
Operation Rolling Thunder
Operation Rolling Thunder was a graduated United States air campaign against North Vietnam, conducted from March 1965 until November 1968 with over 300,000 combat sorties flown.
Operation Solomon (מבצע שלמה)
Operation Solomon (מבצע שלמה, Mivtza Shlomo) was a covert 1991 Israeli military and civilian operation that airlifted more than 14,000 Ethiopian Jews from Addis Ababa to Israel in about 36 hours.
Operation Starvation (飢餓作戦)
Operation Starvation (飢餓作戦) was a United States aerial mining campaign against Japan from March to August 1945, in which B-29s laid over 12,000 mines that cut imports and ship traffic.
Operation Wikinger
Operation Wikinger, meaning "Viking", was a February 1940 sortie by six German destroyers into the North Sea that ended with two sunk by friendly fire and mines, killing 578.
Operation Yellow Ribbon
Operation Yellow Ribbon (French: Opération ruban jaune) was launched by Transport Canada on September 11, 2001, landing 224 diverted flights with more than 33,000 passengers at Canadian airports.
Operational risk management
Operational risk management is the discipline of identifying and mitigating risks from failed internal processes, people, systems, or external events, as defined in banking by the Basel Committee.
Opposed-piston engine
An opposed-piston engine is an internal combustion engine in which two pistons share each cylinder, moving in opposite directions with the combustion chamber between them and no cylinder head.
Order of Daedalians
The Order of Daedalians is an American fraternal organization of military aviators founded by World War I pilots in 1934 and headquartered at Joint Base San Antonio-Randolph, Texas.
Orlando International Airport
Orlando International Airport (MCO) is a major airport in Orlando, Florida, built on the former McCoy Air Force Base and serving Central Florida's theme-park tourism region.
Orlando Sanford International Airport
Orlando Sanford International Airport is a public airport in Sanford, Florida, 16 miles northeast of Orlando, serving as the Orlando area's secondary airport, dominated by Allegiant and low-cost carriers.
Orly Air Base
Orly Air Base was the United States Air Force designation for its facilities at Paris-Orly Airport south of Paris, occupied by American forces from 1944 to 1967.
Orly Airport
Orly Airport, known in French as Aéroport de Paris-Orly, is France's second-largest airport, about 14 km south of Paris, handling roughly 35 million passengers in 2025.
Ornithopter
An ornithopter is an aircraft that generates both lift and thrust by flapping its wings like a bird or insect, spanning rubber-powered toys, micro drones, and research robots.
Orteig Prize
The Orteig Prize was a $25,000 inducement prize offered in 1919 by New York hotelier Raymond Orteig for the first nonstop flight between New York and Paris, in either direction.
Oslo Airport, Gardermoen
Oslo Airport, Gardermoen, also known as Oslo lufthavn, Gardermoen, is Norway's main international airport, serving Oslo and Eastern Norway. Opened in 1998, it handled 27.1 million passengers in 2025.
Ottawa Macdonald–Cartier International Airport
Ottawa Macdonald–Cartier International Airport (IATA: YOW), also known as Ottawa International Airport, is the main airport serving Ottawa, Ontario, named for Fathers of Confederation Sir John A. Macdonald and Sir George-Étienne Cartier.
Otto Kittel
Otto Kittel was a German Luftwaffe fighter ace of World War II, credited with 267 aerial victories on the Eastern Front before his death in 1945.
Otto Lilienthal
Otto Lilienthal was a German aviation pioneer who made the first sustained, repeatable human gliding flights between 1891 and 1896, and whose aerodynamic data guided the Wright brothers.
Ovation Guitar Company
The Ovation Guitar Company, also known as Ovation Guitars, is an American guitar maker founded by engineer Charles Kaman, known for its rounded composite Roundback acoustic guitars.
Overhead valve engine
An overhead valve (OHV) engine, also called a pushrod engine, is a piston engine with valves in the cylinder head operated by pushrods from a camshaft in the block.
Oxygen mask
An oxygen mask is a face covering connected to an oxygen supply that delivers supplemental oxygen, used in medicine for patients and in aviation for low cabin air oxygen.
Pacific Southwest Airlines Flight 1771
Pacific Southwest Airlines Flight 1771 was a Los Angeles to San Francisco flight that crashed near Cayucos, California, in 1987 after a fired airline employee shot the crew, killing all 43 aboard.
Pacific Southwest Airlines Flight 182
Pacific Southwest Airlines Flight 182 was a scheduled flight that collided with a Cessna 172 near San Diego's Lindbergh Field on September 25, 1978, killing 144 people.