Charon's Ark

Description for CHARON'S ARK by Rick Gauger:

A SUDDEN CHANGE OF COURSE

To the teachers and students of Seattle's Garfield High School, the trip was just a public relations lark---for helping a wealthy Pacific island open a science museum, they were to get a free trip around the world.  It all seemed too easy.  it was.  As their chartered 747 crossed the Pacific, a huge spacecraft swooped down, cut off its wings, swallowed it up, and headed deep into outer space.  Next stop:  Charon, the moon of Pluto,

Suddenly the flight crew, the students, and their teacher found themselves the unwilling guests of unseen and unreliable hosts whose life-support systems were breaking down.

Even worse, the humans were caught in a deadly cross-fire between the rapidly falling aliens and a mad computer program that considered only itself indispensable---and whose intentions clearly were to destroy Earth...