•  2025.01.26: Metliner was published to the internet.

The initial set of cities featured on the website includes Atlanta, Beijing, Doha, Dubai, Fukuoka, Hanoi, Ho Chi Minh City, Honolulu, Kaohsiung, Manila, Melbourne, Moscow, Nagoya, Osaka, Sapporo, Sendai, Sydney, Taichung, and Taipei 

• 2025.03.19: Berlin, Chongqing, Hakodate, Mexico City, New York City, Niigata, Okinawa, and Singapore have been newly added to the collection

• 2025.04.18: A brand new interface has been introduced to Metliner, along with the addition of Bratislava, Detroit, Dongguan, Guangzhou, Hong Kong, Lisbon, Macau, Nagano, Okayama, Port Louis, Seoul, Shenzhen, Tokyo, and Vienna to the collection 

• 2025.05.31: Bangkok, Busan, Copenhagen, Daegu, Daejeon, Gwangju, Paris, and Sao Paulo have been newly added to the collection

• 2025.08.05: Auckland, Denver, Kuala Lumpur, Las Vegas, Ottawa, Phoenix, San Francisco have been added to the collection. | Bangkok, Chongqing updated.

• 2025.09.09: Calgary, Edmonton, Kagoshima, Lile, Montreal, Palembang, Toronto, Vancouver, Wellington have been added to the collection. | Osaka, Hiroshima updated.

• 2026.03.03: Albuquerque, Austin, Dallas, El Paso, Harbin, Houston, Kansas City, Little Rock, Los Angeles, Nagasaki, Oklahoma City, Salt Lake City, Seattle, St. Louis, Tucson, Xiamen. | Honolulu updated.