Air jet fighters
A fighter aircraft is a military aircraft designed primarily for air-to-air combat against other aircraft,  as opposed to bombers and attack aircraft , whose main mission is to attack ground targets. The hallmarks of a fighter are its speed, maneuverability, and small size relative to other combat aircraft.
Many fighters have secondary ground-attack capabilities, and some are designed as dual-purpose fighter-bombers ; often aircraft that do not fulfill the standard definition are called fighters. This may be for political or national security reasons, for advertising purposes, or other reasons. 
The word "fighter" did not become the official English-language term for such aircraft until after World War I. In the British Royal Flying Corps and Royal Air Force these aircraft were referred to as " scouts " into the early 1920s. The U.S. Army called their fighters "pursuit" aircraft from 1916 until the late 1940s. In most languages a fighter aircraft is known as a hunter , or hunting aircraft ( avion de chasse, Jagdflugzeuge, avión de caza etc.). Exceptions include Russian, where a fighter is an "истребитель" (pronounced "istrebitel"), meaning "exterminator", and Hebrew where it is "matose krav" (literally "battle plane").
Murray Brewster is senior defence writer for CBC News, based in Ottawa. He has covered the Canadian military and foreign policy from Parliament Hill for over a decade. Among other assignments, he spent a total of 15 months on the ground covering the Afghan war for The Canadian Press. Prior to that, he covered defence issues and politics for CP in Nova Scotia for 11 years and was bureau chief for Standard Broadcast News in Ottawa.
If Canada ever buys Boeing Super Hornet jet fighters, it would be better off with the two-seat variant because they would fetch a better price on the resale market, military planners told the commander of the air force earlier this year.
An internal defence department analysis, obtained by CBC News, also spells out clearly that the 18 warplanes Canada hoped to buy would not be kept once a permanent replacement is purchased for the existing fleet of CF-18s.