Plural of Aircraft

What Is the Plural of Aircraft?

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The Quick Answer

The plural of "aircraft" is "aircraft."

Nothing can stop the attack of aircraft except other aircraft.
It's unbelievable what one squadron of twelve aircraft did to tip the balance.

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The Standard Rules for Forming the Plurals

The table below shows the standard rules for forming the plurals of nouns in English.

Type	Example of Type	Forming the Plural	Plural
Most Nouns	cat scythe	add s	cats scythes
Noun Ending s, sh, ch, x or z	bus dress	add es	buses dresses
Nouns ending [consonant] o	mango zero tomato	add either s or es (There are no rules for this - you have to know.)	mangoes or mangos zeros tomatoes
Nouns ending [vowel] o	patio ratio	add s	patios ratios
Nouns ending [consonant] y	story penny	change the y to an i and add es	stories pennies
Nouns ending [vowel] y	storey () donkey	add s	storeys donkeys
Nouns ending f or fe	dwarf knife	ves and/or s (There are no rules - you have to know.)	dwarfs knives
Exceptions	goose louse	some nouns undergo a vowel or letters change	geese lice
More exceptions	salmon aircraft	some nouns do not change at all	salmon aircraft

Why Is There Confusion over the Plural of Aircraft?

"Aircraft" is the only way to make the noun "aircraft" plural.

Confusion arises because "aircraft" remains unchanged in its plural form. Unfortunately, there is no clever way of knowing which nouns follow which rules. You have to know.