The smallest manned combat aircraft that I know about could have been the Russian I-16 "Rat" used early in WW2 and in the Spanish Civil War. It was one of the first planes that Russia built that was an effective fighter aircraft with one wing. It was also the first operational aircraft to have retractable landing gear.
In today's modern air forces, there are lots of small drone aircraft(or unmanned) that fire missiles. Most of these are used to hit ground targets. While these planes are smaller and more simple than the fighter jets flown by pilots, some of them are still large aircraft with long wing spans.
It would be one of the hand launched UAVs, of which several makes are in service, to include the RQ-11 Raven in US service.
Aircraft built by the military to refuel other capable aircraft (other military craft basically) in midair.
There are no current military aircraft with 6 engines.
Military aircraft are built to fight or to aid in a war effort.
military aircraft are used for military purposes i.e combat, military cargo, extraction of troops and etc.. civil aircraft are ones use for commercial airlines for example. British airways and Qantas.
If you're looking for military aircraft parts, you can find them available for purchase on many different websites. Some sites that offer military aircraft parts are Military Aircraft Parts, DIMO Corporation, and Skylink.
Which military.
Bede BD-5
Military aircraft is an aircraft which has been adapted for the military uses like- Bombing, Air strikes, Combat missions, Soldiers ammunition and transportations, etc. Civil aircraft only provide transport for cargo and passengers.
Military aircraft are designed to destroy the enemy's military aircraft and (sometimes) their civil aircraft. They also preform bombing tasks as well as a few non-combat tasks. Civil aircraft are mainly transports and crop sprayers that don't do much fighting. Military aircraft are designed to fulfill a multitude of roles that are specified by the Armed forces that will be using these aircraft. These roles include Air attack as well as air support and defence of other military assets. Transport and surveillence are also key roles that military aircraft fulfill. Civil aircraft are designed to perform commercial transport as well as personal use and sports roles. Civil aircraft have no need for stealth or combat survivability the way military Military aircraft do.
For military aircraft, look for the shape and size, and length For Pilot, look for the color of the suit
Gordon Swanborough has written: 'Military transports and training aircraft of the world' -- subject(s): Military Airplanes, Transport planes 'United States military aircraft since 1909' -- subject(s): History, Military Aeronautics, Military Airplanes 'Combat aircraft of the world' -- subject(s): Military Airplanes 'United States military aircraft since 1908' -- subject(s): Military Aeronautics, Military Airplanes 'North American' -- subject(s): North American airplanes (Military aircraft), Rockwell airplanes (Civil aircraft) 'World's airliner registrations' -- subject(s): Airplanes, Registers 'Military aircraft of the world' -- subject(s): Military Airplanes 'British Aircraft at War, 1939-45' 'Civil aircraft of the world' -- subject(s): Private planes, Transport planes
Of course, navy aircraft are military aircraft.