Since the implementation of TSA security checks, boarding an plane in the U.S. has become a major hassle and time-sink. It's not uncommon to wait in line for over 1-2 hours, then have to take off your shoes & belt before getting scanned and/or patted down by a TSA agent.
While waiting in line, however, I've seen people who appear to be non-pilots or airport employees simply walk through the gate after flashing some sort of identification. And I've been told that having certain security clearances allow you to bypass the normal procedure altogether. Personally, I'd rather go through an extensive background-check process every few years than deal with the TSA every single time I have to fly somewhere for work.
In the United States, does having a federal security clearance of certain levels allow you to bypass the normal airport security process?
Note: I'm mostly concerned with domestic flights FROM and TO U.S. destinations. I rarely travel to other countries these days.