One of the questions not answered yet is whether the Cirrus was on
flight following or not. Boulder is a few miles outside of Denver
International's airspace, but within 30 nm from it, meaning all
powered planes are required to have mode C transponders. I assume that
both the Cirrus and tow plane had ones. When I flew at Boulder with
MHG for a couple of weeks last summer, I was shocked by the amount of
traffic I saw. Especially, the traffic south of Boulder was like 6
times more crowded than the traffic I'm used to in Truckee/Minden area
(note that Reno is class C and Denver is class B). I cannot think of
flying into such an area without flight following by Denver approach.

My condolence to the towpilot's families. I hope that this isn't the
young ones who towed me or helped me rigging my glider.

Good job on the glider pilot who brought passengers back home safe.

-Gen