How has the process of booking airfare changed?

The booking process is largely the same as prior to the travel initiative. 

The traveler or their designated arranger will continue with the normal process of first generating a T# for budget approval and authorization to travel.  From there, either the traveler or his/her arranger will book the airfare (and other expenses).  The only distinction is they must purchase the airfare with CTP/Concur and must have an approved T# at the time of purchase.