Sure. Pearson has tentative plans (as in, it's a possibility) for a partially enclosed LRT station in the ground level of T1.
Anyway, assuming Finch West is built to Humber College, the easiest way to bring high capacity TTC to Pearson AND intercept a frequent GO service is to extend Finch West to T1. Incidentally, this was a Metrolinx idea.
Was that ever included in the Master Plan for the airport, or the design for T1 in specific?
And an elevated stop is somehow grander? A loop at ground level where public transit currently stops could certainly be built to have a bit more grander than a simple LRT stop and doesn't need to be elevated. In fact I kind of wish that the GTAA had built an underground transit hub to accommodate LRT, Heavy Rail, and buses rather than the sort of hodge podge that has happened, although it makes no sense to build something (and incur the costs) if you don't expect it to be used in 10 - 20 yrs.
I'm just saying a simple surface stop with a few shelters like the ones planned for most of Transit City I don't think would be sufficient at this location. Perhaps it doesn't need to be elevated per say, but I think it should be something beyond what looks like a streetcar stop on steroids. At this location, perhaps more than almost any other, perception and impression is important.
And yes, I would have hoped that a provision would have been made for some kind of local transit hub when they built the terminal, especially because it's relatively new. I know Ottawa's "new" terminal (circa 2003) made such a provision in the form of a gap between the parking garage and the upper departures deck, with pedestrian walkways between the terminal and the garage one level below that deck. IIRC correctly, it's wide enough to support 2 tracks and a central platform.