The capacity to win and hold control of the air where and when it is needed, including the suppression of enemy air defences.
The Capability Development Index tracks the events that move a capability — operational use, technical breakthroughs, procurement decisions and the industrial base behind them — and places each on the record with the date it happened.
Recent developments cover the current period. Historical developments are the inflection points that produced Control of the Air as it stands today.
The article dates the progression from kites to balloon warfare to the third century. Balloons later carried artillery observers, giving armies elevated observation of the battlefield.
Airships, particularly zeppelins, were put to military use in the early years of the twentieth century. They were used for bombing cities, extending warfare from observation to aerial attack.
Aeroplanes were used militarily for the first time in the Italo-Turkish War, initially for aerial reconnaissance. Aerial combat followed as aircraft were used to shoot down enemy reconnaissance planes, marking the birth of air-to-air fighting.
During the First World War aircraft and zeppelins were used for strategic bombing, and the rise of fighter aircraft and air-to-air combat produced the doctrine of air superiority. Closer integration of attacking aircraft with ground operations, or battlefield support, also developed in this period.
The German monoplane could aim its gun simply by pointing the aircraft at an enemy, creating the forward-firing single-seat fighter and, with it, dedicated air-to-air combat as a distinct form of warfare.
The Second World War saw an expansion of strategic bombing alongside the introduction of airborne forces, missiles and early precision-guided munitions. Aircraft carriers became especially important for projecting air power across oceans.
The integrated air defence network let a numerically smaller fighter force meet German raids efficiently during the Battle of Britain, establishing ground-controlled interception as the basis of modern air defence.
Drop tanks gave escort fighters the range to accompany bombers to distant targets and back, drawing the German fighter force into attritional battles it could not sustain and shifting air superiority over Europe to the Allies.
American F-86 Sabres and Soviet-flown MiG-15s fought at transonic speed along the Yalu River, establishing pilot training and tactics as decisive factors in jet combat and shaping fighter doctrine for the following generation.
An early Sidewinder missile downed a People's Liberation Army MiG-17 over the Taiwan Strait, opening the missile era of air combat and prompting the Soviet Union to reverse-engineer an unexploded round recovered from the encounter.
The first hours of Operation Focus caught Egyptian aircraft lined up on their runways, establishing air supremacy before the ground war began and showing that a first strike could decide a conflict's outcome within a single morning.
Poor air-to-air kill ratios over Vietnam prompted dedicated adversary training and a review of missile reliability, more than doubling the exchange ratio in the war's final air battles and establishing a model other air forces later copied.
Sustained strikes against Pakistani airbases and numerical and doctrinal advantages produced the largest air campaign fought over the subcontinent since the Korean War, shaping both countries' air force doctrine for decades afterward.
Stealth F-35I aircraft and standoff strikes suppressed Iranian air defences and grounded much of its fighter force, allowing sustained Israeli sorties deep into Iranian territory with limited air-to-air resistance over the following 12 days.
Days of aerial engagement followed a terrorist attack in Kashmir and India's retaliatory strikes, producing the largest beyond-visual-range air battle in decades; India did not confirm the scale of its own losses.
The contract award ended a competition with Northrop Grumman for a crewed sixth-generation fighter intended to operate alongside autonomous collaborative combat aircraft, pitched as restoring a generational lead over Chinese fighter designs.
Under the cabinet-approved execution model for the Advanced Medium Combat Aircraft, private firms could bid alongside state-run Hindustan Aeronautics to build the prototype, a departure from India's historical reliance on the public sector for combat aircraft.
Indonesia and Azerbaijan were among the countries discussing production co-operation or purchase of the aircraft, part of an effort to build an export base for Turkey's first indigenous fighter beyond its domestic air force order.
The Defence Acquisition Programme Administration advanced the domestically designed fighter toward serial output while Indonesia's contribution to the joint development cost remained substantially in arrears, straining a partnership agreed a decade earlier.
The agreement created a permanent international body to govern development of a shared sixth-generation fighter intended to replace Typhoon and F-2 aircraft from around 2035, with production work divided across the three countries.
A tailless, three-engine design from Chengdu and a separate heavy fighter from Shenyang appeared over Chengdu within the same day, the first public evidence of Chinese sixth-generation fighter development and a break from established twin-tail layouts.
The twin-engine, carrier-capable design shown at the Zhuhai Airshow gave China a second stealth fighter type alongside the J-20 and positioned an export variant to compete with the F-35 in markets closed to US arms sales.
The biennial exercise brought together air forces from Asia, Europe and the Pacific for large-scale combined air combat training over northern Australia, reflecting its growth into one of the largest multinational fighter drills held anywhere.
Relatively cheap unmanned equipment spread widely in the twenty-first century, with proliferation accelerating after the start of the Second Nagorno-Karabakh War in 2020. This shifted the balance of air combat capability towards states and actors unable to field manned air forces.
Airborne early warning control, stealth aircraft and beyond-visual-range missiles combined to destroy Iraq's air force and air defences at a lopsided exchange ratio, setting a template later air forces sought to replicate.
Decoy drones drew Syrian radars to switch on, allowing jamming and strikes to blind the integrated air defence system before fighters engaged; Syria lost dozens of aircraft for negligible Israeli losses in the air battles that followed.