Recommend reading "In safe hands (the how and why of airline travel) " by David Robson. It is based on a lecture series titled "Things that go bump in the flight"
Published by Aviation Theory Centre, South Melbourne.
ISBN 1 875537 49 X . My copy is the 1st edition published 1999.
My "nervous flyer" friends say it's well worth reading and has helped them overcome their high (altitude) anxiety.