How so?

Side note: in my Indoc class there was someone who lived in CLT and got DFW for training, and someone who lived in DFW and got CLT. The usual training admin / schedulers wouldn't give them the time of day when it came to switching, but one emailed the head of training (now no longer with the company) directly and she had it changed for them inside of 20 min. YMMV.