Probably for the same reason "the pilot" didn't, you won't get through!!
I have on several occasions. The phone never rang more than three times. They were always very polite and attentive. Once I reported a death threat I read on this forum the SS was very interested and took down all the information even called me back and assured it was a person they were watching but was most likely harmless.
You are right. You can't get through.
I'm amazed that people think it is so easy to get through to the Whitehouse.
Barbara Olsen and her husband were trying to report a plane being hijacked and they had trouble getting through to the right people in the government, let alone some pilot. As it was the government sent planes from a military base too far from the Pentagon to do any good, instead of using planes from the base 10 miles away.