Airlines is a noun. It's the plural form of airline.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
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Some airlines that offer free layovers as part of their travel packages include Emirates, Qatar Airways, and Turkish Airlines.
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "twirl" is a verb.
The part of speech for "explicit" is an adjective.
The part of speech for "indefinite" is an adjective.