Lester B. Pearson International Airport, located in Toronto, Ontario, Canada, is one of the busiest airports in North America and is the primary airport serving the Greater Toronto Area. The airport is named after the Nobel Peace Prize-winning former Prime Minister of Canada, Lester B. Pearson. The airport was originally known as Malton Airport, named after the community in which it was located. It was built in 1937 as a military base to serve the Royal Canadian Air Force during World War II. However, due to the increased demand for air travel in the 1950s, the airport was expanded and modernized to become the international airport it is today.

The airport code YYZ was determined in the early 1960s as part of the International Air Transport Association's (IATA) three-letter airport code system. The code was chosen to represent the airport's original name, Malton, as the name was made up of alternating consonants and vowels, YYZ is an abbreviation of the name.

Today, Pearson International Airport is an important hub for the region, connecting the Greater Toronto Area to destinations across Canada, the United States, and the world. The airport is served by many domestic and international airlines, including Air Canada, WestJet, Air Transat, American Airlines, British Airways, Lufthansa, and others. It is currently the largest and busiest airport in Canada, handling an average of 1,200 flights and over 35 million passengers on an annual basis.

In addition to its commercial flights, the airport also serves as a hub for cargo operations, with several freight airlines operating out of the airport. The airport is currently undergoing a multi-billion-dollar expansion to increase its capacity to accommodate the growing demand for air travel.

The airport has continued to be a leader in the aviation industry, with its modern infrastructure and amenities. It has been recognized as one of the most efficient airports in the world due to its efficient operations and customer service. With its convenient location and world-class facilities, Pearson International Airport continues to be an important hub for air travel in Canada and the wider world.