That can not be answered in less you divide aircraft in groups. An example question is: What is the most widely used type of aircraft for Private pilot training? That answer would be a Cessna 172 Skyhawk. To get a answer you have to be more specific.
United State has the largest number of military aircraft. Roughly more than 7500. It has also the most advanced aircraft.
Transportation, launches, recovery, and maintenance of naval aircraft.
The USS Eisenhower carrier is the most strongest aircraft carrier in the World.
The RAF primarily used captured German aircraft for flight testing & evaluation purposes. German aircraft that were severly damaged could not be used.
The most powerful combat aircraft in the World is the United States F-22 Raptor, Russian Mig-29, the republic of China and Taiwan Mig-35.
Aluminium is used for most parts on most aircraft.
The most-produced, and thus probably the most-used military aircraft would be the Mikoyan-Gurevich MiG-21 'Fishbed' and its variants.
in the sea
The most commonly used type of Boeing aircraft is the Boeing-747 passenger jet. This airplane is used internationally to carry people all over the world.
Most aircraft are fitted with a gyroscope which is used to maintain orientation while an aircraft is changing direction or climbing and descending.
I think it's DC-9.
The most current and up to date version of the Aviation Consumers Used Aircraft Guide is the 10th edition, which is now available on CD-ROM. This is the absolute starting point for anyone wishing to purchase an aircraft.
There are three types of aircraft that are most frequently used by airlines in the United States. These aircraft are members of the Airbus and Boeing families and also the McDonnell Douglas MD-80.
the metal used in building most planes is alumiun as this type of metal as it can expand as the pressure in side the aircraft is greater than the pressure outside the aircraft. it is also the lightest suitable metal although boeing's 787 has been constucted with acompisite material.
Premier Aviation is one of the most widely used Aircraft charters having been doing business for nearly 20 years. Altitude Aviation and Regency Air Charter are also widely used.
They use a stream of smoke in the tunnel to figure out the air current when it is flowing over the wing of an aircraft mainly to produce the most arodynamic aircraft possible
Do you mean used? Please be a little more specific, for example, What engines are used in aircraft, What instruments are used in aircraft.