This ambitious schematic has enough space to make Pearson rival the biggest! Watch out Dubai!
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This diagram really shows how much room there is to expand passenger facilities at Pearson. I assume those yellow and burgundy cross hatched areas labelled "Other Airport Development with Passenger Terminal Facilities" are available for terminal expansion? Seems runway capacity is the major growth limiter at Pearson.
Yellow are potential development lands. That I know of there was a plan for a North Deicing facility in the Northern part of the central yellow and red hatched area. The diagram also appears to be pre Infield Terminal since it also is located in the North part of the central area. Also shown is the planned twin of runway 05/
23 and shows it South of the existing runway 05/23
More important are the lands outside the Airport grounds. The yellow surrounding 409 and the areas along Derry Rd. As these would be able to absorb other airport facilities to free up airport land for other uses. For example moving GTAA corporate offices from the South-East corner of the property.
As I understand it, Pearson doesn't have
true triple takeoff/landing capability because 06L/24R and 06R/24L are too close together. Some expropriation would be needed to expand runway capacity. Maybe another runway closer to Derry road, north of 05/23, along with some O'Hare-lite reconfiguration.
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Pearson runways are assigned based on wind direction and wind speed, weather, runway conditions/availability, type of aircraft, operational efficiency and time of day.
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I believe the ultimate plan (as it was stated when they built 6R/24L and added 15R/33L) was to pair 5/33 as you suggest. I believe the plan was south of the current 15/33, and that due to buildings at the east side it would only be able to be used as a 33 for take offs... It's been a while, though, and I don't have those plans
Runway 05R/
23L would be south of the current runway 05/23 not north. It's shown in the slide above.
I believe the current constraint is passenger handling more that runway capacity. There has been a quick (in aviation terms) shift from smaller aircraft to larger higher capacity aircraft. So more passengers are being moved with the same or similar number of aircraft movements. Having been in YYZ a few times I can confirm that the passenger facilities are indeed to small to handle the number of passengers it sees. T1 international is absolutely rammed during the Evening European departure bank. There is not enough room around the gate waiting area to accommodate the 200-450 passengers waiting for any one flight given space being taken up by restaurants in what should be waiting areas (looking at you Fetta, Heirloom Bakery, Vinifera, and Marathi). This begins with building the Transborder pier, giving additional space and freeing up swing gates on the E pier for international flights.
My dream scenario for the International pier would be for Air Canada's Maple Leaf Lounge and Signature suite to move to the outer perimeter of the terminal (giving great plane spotting views), with direct connections to gates E74-E77. And moving restaurants like the above mentioned Fetta et al up to the third floor in a food court style area, this would free up space at the gate waiting areas and re distribute some passengers (first by allowing direct gate access from Maple Leaf Lounge and second by having people sitting and eating at the restaurant 'food court'
The difficulty is that the upper floor is used by arriving passengers to walk to the customs hall. I don't think that's an un surmountable obstacle but one I doubt GTAA would spend money on.