because "aircrafts" sounds stupid.
The plural of aircraft is aircraft.One aircraft, two aircraft, ten aircraft.
The compound noun 'aircraft' (no space) is the same for both the singular and the plural form.Examples:An aircraft landed on the runway. (singular)Several aircraft circled the field waiting to land. (plural)
The plural of aircraft is aircraft. Much like how the plural of deer is deer. (Singular: That is such a beautiful aircraft / Plural: Look at all of those aircraft)
The noun 'aircraft' is an uncountable noun. The singular and the plural possessive form is aircraft's.EXAMPLESOne aircraft's owner has not paid the airport fee. (singular)All of these aircraft's owners are delinquent in their fees. (plural)
Some examples of singular nouns that have the same form in both singular and plural are: sheep, deer, fish, aircraft.
Both the singular and the plural is aircraft.The plural possessive form is aircraft's.Example: All of the aircraft's inspections have been completed.
Some example nouns that are the same for singular and plural are:aircraftarchivesbinocularsbisonchalkdeerelkglassesheadquartersmoosenewsoffspringpajamaspantspolicereindeersalmonscissorsseriessheepspeciesswine
Aircraft is both singular and plural e.g. the pilot boarded his aircraft and took off; we watched as aircraft of all shapes and sizes filled the sky.
Examples of nouns that are the same in the singular and the plural:sheepdeergrouseChineseSwissLebaneseoffspringknowledgebarracksinformationbutterswine
Words that are the same in the singular and plural:scissorsinformationsheepmusicnewstrousersheadquartersgolddeeroffspring
Yes, words that keep the same form in singular and plural are considered irregular plurals. Examples include sheep, deer, and aircraft.
The plural form of "plane" is "planes." This applies to both the context of aircraft and the geometric concept of flat surfaces. In both cases, the spelling remains the same, simply adding an "s" to indicate more than one.