### World War II and the Commonwealth Air Training Plan During World War II, Malton Airport played a vital role in the Allied war effort. The airfield served as a training school under the British Commonwealth Air Training Plan (BCATP). Pilots from Canada, the United Kingdom, and other Allied nations trained at the No. 1 Elementary Flying Training School located on-site. The wartime era also saw the establishment of aircraft manufacturing facilities adjacent to the airfield, which produced combat aircraft like the Avro Lancaster bomber. ## Evolution and Renaming Following the war, commercial aviation experienced rapid growth, prompting the federal government to purchase the airport in 1958 to facilitate major expansions. ### Becoming Toronto International Airport To reflect its growing status as an international gateway, the facility was renamed Toronto International Airport in 1960. During this decade, the airport underwent significant modernization, including the construction of new runways and terminal facilities to accommodate the jet age.

### Honoring Lester B. Pearson In 1984, the airport was officially renamed Lester B. Pearson International Airport in honor of Canada’s 14th Prime Minister. Lester B. Pearson, who also won the Nobel Peace Prize in 1957, was a key figure in Canadian diplomacy and international relations. The name change cemented the airport's identity as a symbol of Canada's connection to the global community. ## Architectural Milestones and Terminals As passenger volume grew, the airport's infrastructure had to adapt. The evolution of its terminals highlights the changing demands of modern air travel. ### The Iconic Aeroquay 1 Opened in 1964, Aeroquay 1 was a groundbreaking architectural achievement. Designed by John B. Parkin, the terminal featured a circular design with a central parking garage, allowing passengers to park close to their gates. While revolutionary for its time, the rise of jumbo jets and increased passenger traffic eventually made the circular design obsolete. Aeroquay 1 was demolished in 2004 to make way for the current Terminal 1.

### Modern Terminal Expansion Today, Toronto Pearson operates two active terminals: Terminal 1 and Terminal 3. * **Terminal 1:** Opened in 2004, this massive, state-of-the-art facility is one of the largest buildings in the world by floor area. It serves as the primary hub for Air Canada and other Star Alliance partners. * **Terminal 3:** Opened in 1991, Terminal 3 was originally built as a private venture to ease congestion at Terminal 1. It was later acquired by the Greater Toronto Airports Authority (GTAA) and now serves WestJet, Transat, and various international carriers. ## Key Facts and Trivia About YYZ Beyond its historical timeline, Toronto Pearson is home to unique operational details and historical milestones. ### Why the Code "YYZ"? Many travelers wonder why Toronto's airport code is YYZ. In the early days of aviation, Canadian airport codes were based on existing weather station codes. The transmitter code for the station in Malton was "YY." The letter "Z" was added to denote that the station was co-located with a municipal airport in Toronto. Over time, "YYZ" became a cultural identifier for the city of Toronto itself, even inspiring a famous instrumental track by the Canadian rock band Rush.

### A Critical Hub for Global Transit Toronto Pearson is one of only a few airports in the world to offer US Preclearance facilities. This allows US-bound passengers to clear customs and immigration before boarding their flights, simplifying travel to the United States. The airport serves as a major economic engine for the province of Ontario, employing tens of thousands of people directly and indirectly. ### Operation Yellow Ribbon On September 11, 2001, following the closure of US airspace, Toronto Pearson played a crucial role in Operation Yellow Ribbon. The airport accepted 19 diverted international flights carrying over 4,400 passengers. Local airport staff, volunteers, and community members coordinated emergency shelter, food, and support for the stranded travelers during the crisis. ## Toronto Pearson Today Managed by the Greater Toronto Airports Authority (GTAA) since 1996, Toronto Pearson continues to invest in sustainability, technology, and passenger experience. From its humble beginnings as a grass airfield in Malton to its status as a premier international hub, YYZ remains a central pillar of global aviation and Canadian history.