I had kind of an out-there thought about how to solve the Airport Corporate Centre employment region last-mile problem.
Extend the Eglinton Crosstown and make ACC one giant loop. The stop-spacing is on average ~450m. Stations are more or less St. Clair style streetcar stops. Service would be surface level and St. Clair street-car like, which I think is sufficient for the low-density built-form.
I made a 5-minute drawing to explain it (so excuse questions on alignment through 401/427 interchange). Not sure how to integrate the Mississauga Transitway (does it even need integration aside from the terminal station? They serve separate uses).
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