Les Posen in Australia is a behaviorist. Tom Bunn in the US developed a unique system. Les uses breathing training to generally increase vagal calming and virtual reality to habituate clients to flying. Tom teaches clients to automatically block stress hormones and activate vagal calming when flying. Both found CBT inadequate. Both discourage use of false safety behaviors (FSBs), trying to stay distracted and looking for signs that the flight should be avoided due to the weather or how stressed one is feeling. Both challenge clients to face flying head-on. See fearofflying.com/library/abstract-point-of-no-return/
Les is at flightwise.com.au and Tom is at fearofflying.com