Is "of which" correctly used?

English as a Second Language English Vocabulary, Grammar and Idioms
1

The plane for this particular flight is the new Airbus 350-900ULR (ultra-long-range) aircraft, of which SIA is the first carrier to use.

Is “of which” correctly used?

Thanks.

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2

This sounds very confusing. The relative pronoun construction ‘of which’ seems to be irrelevant.

I would rewrite as -

The plane for this particular flight is the new Airbus xxxxxx, first used as a carrier by SIA

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