One Two Three Airlines (branded as OTT Airlines), was an airline headquartered in Shanghai and focused on the Yangtze Delta region. It was launched as a subsidiary of China Eastern Airlines in February 2020 and was merged into China Eastern Airlines in September 2024.
2020-2024[]

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On 31 August 2024, China Eastern Airlines announced that it will absorb OTT Airlines, intergrate it into parent mainline operations. The operation merge effected on September 22, 2024, marking the dissolution of the airline.
| Current airlines China Cargo Airlines (51%) | China Eastern Yunnan Airlines | Shanghai Airlines | China United Airlines Former/defunct
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