After years of honing their command-line skills, many older, seasoned advisors prefer to continue working in a cryptic environment. But increasingly, GDSs and many agencies are encouraging these veterans to switch to the GUIs, which have more features and promise to offer additional content as IATA's New Distribution Capability grows to permeate the industry.

It is also easier to train new agents on GUIs, eliminating the need to learn an outdated cryptic environment. Eventually, most expect green-screen GDS interfaces to fade into nonexistence.