It might seem obvious to you, but remember to be prepared to go through security. If you don't fly regularly, brush up on the most up-to-date TSA regulations beforehand, so you don't risk getting stopped and further delayed.
Kerri Stuart, host of All Aboard TV, reminds travelers that, "During the holidays, many of the people flying are not used to flying. As a result, they forget things like liquids in their carry on luggage, taking off shoes through security, etc. In addition to crowds, that's why it takes longer. So, be prepared for security screening. Pack light for carry on, wear easy on/off shoes, know where your laptop is and keep it in an easy-to-access location so you can be quick."