[6] On 7 May 2015, Royal Caribbean released an announcement regarding an agreement entered with Meyer Werft about ordering the fourth Quantum-class ship, with a scheduled entry into service of 2019.

[10] On the same day, Michael Bayley, president and CEO of Royal Caribbean, confirmed an announcement made earlier in April 2017 that the ship would be based in the Chinese market and would feature accommodations and offerings specifically designed for the Asia-Pacific region.

[14] On 3 June 2019, Huang Xiaoming and Angelababy christened the vessel in a ceremony celebrating the ship's arrival in China.

[5] On 18 April 2019, Spectrum of the Seas departed on her maiden voyage from Barcelona to Singapore, with two short sailings thereafter before arriving in Shanghai.

[6] Due to the COVID-19 pandemic affecting China, Spectrum of the Seas carrying 1,551 crew members[15] and was temporarily redeployed from Shanghai to Sydney on 14 February 2020 for a series of complimentary cruises for first responders of the 2019–20 Australian bushfire season.