The plural of aircraft is aircraft. Write “one aircraft,” “two aircraft,” and “several aircraft.” The word keeps the same form when the number changes.
Aircrafts is not the usual plural in standard general English. Use the surrounding words and verb to show whether you mean one vehicle or more than one.
Singular and plural examples
| Number | Correct sentence |
|---|---|
| One | The aircraft is ready. |
| Two | Both aircraft are ready. |
| Several | Several aircraft were inspected. |
| Unspecified | Some aircraft have longer ranges. |
In “The aircraft is ready,” is signals a singular subject. In “The aircraft are ready,” are signals a plural subject. Both sentences can be correct.
Why aircraft does not add -s
Aircraft belongs to a group often described as unchanged plurals or zero plurals. Sheep and deer are other familiar examples, although every word in this group has its own usage pattern.
Do not assume that a plural must visibly end in -s. Number is a grammatical meaning, not simply a spelling ending. Numerals, determiners, and verbs can make that meaning clear.
Aircraft is still countable
An unchanged plural is different from an uncountable noun. You can count aircraft directly: “We saw five aircraft.” You normally would not count information in the same way.
To describe a collection, use a phrase such as “a fleet of aircraft.” The verb usually agrees with the head of the phrase: “A fleet of aircraft was parked nearby.” Collective-noun agreement can vary by English variety and intended meaning.
Aircraft, airplane, and plane
Aircraft is a broad term that includes different kinds of flying machines. Airplane, aeroplane, and helicopter name more specific types and normally take -s in the plural.
Choose the term that matches your meaning. Three helicopters are three aircraft, but aircraft should not always be replaced by airplanes.
Possessive forms
For one vehicle, “the aircraft’s engine” uses an apostrophe plus s. Because the plural aircraft does not end in s, its plural possessive can also be aircraft’s. When ambiguity matters, write “the engines of the aircraft.”
Practice
Correct the sentence: “Three aircrafts was waiting.”
Answer: “Three aircraft were waiting.”
More agreement patterns
“Every aircraft is inspected” refers to the members one by one and uses singular agreement with every. “All aircraft are inspected” treats aircraft as plural in this example. “One of the aircraft is missing” has one as the head of its subject.
These sentences show why the unchanged noun alone cannot determine the verb. Identify the whole subject phrase before choosing is or are.
Aircraft in compound expressions
In “aircraft engines,” aircraft modifies engines. The engines are plural, and the modifying noun keeps its usual form. “Aircraft maintenance” names a field or activity and does not imply that aircraft is singular.
Edit for clarity
If “the aircraft” leaves the number unclear, specify “the single aircraft,” “both aircraft,” or “all three aircraft.” You can also name the type when it matters: “two helicopters.”
Correct “These aircrafts has landed” to “These aircraft have landed.” Both the unnecessary -s and the singular auxiliary need attention. Fixing only the noun would leave an agreement error behind.
Frequently asked questions
Is aircraft singular or plural?
It can be either. Check the number words, verb, and context rather than the noun alone.
