FR: on est arrivé(s)


English - Australia
Why does the past participle of the subject pronoun "on" take on a plural (like nous) when conjugated in passé composé with être?

For example « On est arrivés à l’aéroport 2 heures avant le vol » ?

I know "on" here means "we" but I thought it was conjugated the same way as "il, elle" etc. Is it simply because it infers plurality in it's usage?

Merci d'avance tout le monde !
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