Unfortunately it depends on the TSA agent. My name doesn't fit on a ticket (9 letter first name, 9 letter middle name, and 9 letter last name) and so my first name was missing 1 letter. It was never an issue until one day a TSA agent refused to let me through and made me go back to the Jetblue counter and have them print me a ticket with my full name. The Jetblue agent said that was impossible as my name didn't fit on the ticket so just go back through the line and if there was an issue call them over. I got through the line and told the new TSA agent what happened. I was told point blank that the other TSA agent was just being a jerk and hard butt. Yes it was a rule and warning but it wasn't like it was a huge jump between names.