A DC-10 and 747 collide. In the distant future, a time travel team prepares to snatch passengers, leaving prefabricated smoking bodies behind. And an air disaster investigator will get a phone call that changes his life ... and the end of the world as we know it.
This is an old favourite - aircrash time-travel save-the-future SF. I like it because (1) the 1980s aircrash investigation milieu is interesting, (2) the protagonists are quite unsympathetic and they're enjoyably unreliable as narrators (in fact the whole time travel thing lets the unreliability of the narrator be performed and multiplied). And (3) the whole thing is a gigantic shaggy dog story on "deus ex machina".