I've been a travel agent and travel agency owner for more than a decade, and so started reading this book with a great deal of interest.
I hadn't even finished the first page before I fell off my chair with astonishment at the errors the author was perpetrating - 'a consolidation ticket is normally valid for a year and fully flexible'. This is completely wrong - consolidated/discounted tickets are always highly restricted.
I read on to page two. And major mistake two. 'A good travel agent can often save you more by exploiting IATA fare construction rules allowing you to fly up to 25% more miles between two points either free or for a small surcharge'. Again, dead wrong.
In more than ten years as a travel agent, I have never ever issued a single mileage based fare (such as the author advocates in the preceding paragraph). These days, with most fares being 'route based' rather than 'mileage based' it is exceeding rare to find such fares at good values.
Other parts of the book (which claims a 2000 publication date) are curiously out of date, probably because they have been culled from the author's newspaper columns over many years - for example, 'wait for the new generation of featherweight PCN digital mobiles, allowing people to call you wherever you are.' Excuse me, but featherweight (whatever that means) digital phones have been out there for quite a few years already....
All in all, an extremely disappointing book, full of errors and light on real value. If you're looking for a book like this, I'd recommend either the currently out of print 'Airline Passenger's Guerrilla Handbook' by George Brown or 'Fly cheap!' by Kelly Monaghan.