In the context of the input sentence, determine the relationship between 'Airbus A380' and 'Singapore Airlines'.
Options: operator, original broadcaster, creator, subsidiary

On the major airlines operating long-haul services out of Sydney and Melbourne, economy seat width ranges from 43 centimetres to the 48.25 centimetres on Singapore Airlines Boeing 777‑300ER, Airbus A380 and A330-300 flights.
operator