Two other titles later appeared, Thinner (1984) and The Regulators (1996).
Rage- A kid brings a gun to school, shoots his teacher, gets the classroom on his side, and they all drive a snotty kid crazy. This book was written, I believe, before anyone had actually done any such thing. In 1999, a copy of Rage was found in the locker of Michael Carneal, a high school shooter, and has been connected to several other high school shootings. Despite the rather terse description I've given it here, it is well written, though I find the end rather unbelievable.
The Long Walk- People get into a marathon to the death to compete for cash prizes. Literally, the last man walking wins. Everyone who falls down, gets shot, sometimes incompetently. Throughly unpleasant.
Roadwork- A guy disappointed that his house is going to be torn down to make room for a road, loses his job, loses his wife, goes crazy and blows up the road. (Though this one has the least plot, it's the one I like the best.)
The Running Man- In a bizarre reality TV show of the future, people are hunted through the country by average citizens who win money and prizes if their information leads to the hunted person's death. But Ben, the protagonist and current Running Man, finds a way to get back at the company running the show by crashing his hijacked plane into the corporation's building.
Thinner and The Regulators are still pretty easy to find.
Say what you want about Mr King as a writer, but as a prognosticator, you could do worse.
Note:
There is one other book that I know of that uses a hijacked plane as a weapon, Tom Clancy's Debt of Honor(1995), and several movies that have similar ideas, such as Con Air.