When you are a big jet, and the ATC sends a small turboprop less than 3 miles ahead, and expect that you will maintain the separation...
It's the same for the little guys...I got turned onto a 3 mile final in a C152 with a B73 crossing the outer marker for the same runway.
Wound up having to ask for the parallel in Spanish, as the controller didn't see much of a conflict (at least in English).
Got a beer from the US 73 crew for that one.
