OTT Airlines
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| Founded | 26 February 2020 | ||||||
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| Commenced operations | 28 December 2020 | ||||||
| Ceased operations | 22 September 2024 (re-integrated into China Eastern Airlines) | ||||||
| Hubs | Shanghai Hongqiao International Airport | ||||||
| Fleet size | 26 | ||||||
| Parent company | China Eastern Airlines | ||||||
| Headquarters | No. 33 Guangshun Road, Changning, Shanghai | ||||||
One Two Three Airlines (Chinese: 一二三航空公司; pinyin: Yī'èrsān Hángkōng Gōngsī), branded as OTT Airlines, was a Chinese 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.