Being a new employee and planning recent travel to Chicago, I found out that (NASA?) regulations don't allow purchase of the ticket until 5 days prior to departure. Having come from private industry, the wait period was explained ot me as the Govt avoiding cancellation travel plans. While waiting for the purchase of a ticket, I watched as more flights became sold out, boosting the cost of the eventual cost of any ticket. Not being able to have a flight w/any certainty only 5 days prior to travel affects booking of airport shuttles, rental cars and other travel arrangements. More time is spent by the employee to track this and attempt to make sudden last minute changes to accommodate the flight eventually purchased.
Idea No. 16119