First I'd argue UPX, not EWLRT, is 'the' airport link, but ignoring that, there are some examples I can think of for at grade airport links:
- Paris-Orly is connected with a grade separated people mover connecting to RER B but it also has the at grade tram line 7, so that's kind of an example. (Yes, Paris Orly is a secondary airport with 32 million passengers a year vs 49 million for YYZ, but Paris is also a much larger city than Toronto)
- DFW airport in Dallas (75 million passengers a year) has only the DART orange line, which is LRT with grade crossings, though it has very few grade crossings because it isn't in median, making it more like Calgary C-Train.
- The new Crenshaw LAX LRT line also has a few grade crossings, and is partially in median, though it is also more like C-Train in terms of grade separation, stop spacing, etc.
- Phoenix also has completely at-grade median LRT that leads to a people mover that goes to its airport (46 million passengers a year). This is the only major rail transit line in Pheonix.
That said the at grade EWLRT was really dumb because it connects to the fully grade separated Mississauga Transitway, which imo is more important than the airport in terms of grade separation. At grade median LRT is just generally not great for major corridors because it's just slow, especially with the 500m stop spacing that we're seeing in Toronto. The number of stops on the old ECLRT was ridiculous. (FWLRT is similar but I don't mind as much because it seems to be more a 'high capacity slightly faster bus' feeder route as opposed to rapid transit on a major regional corridor)