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TSA Checklist
It can be hard to keep up with TSA regulations in the U.S. as much has changed over the years. See here a full list of what to do.
Liquids, gels and aerosols for carry-on must be in a container no more than 3.4 oz, and all containers stored inside of a 1-quart-sized ziplock baggie (only 1 baggie/person)
Check the list of prohibited items for both carry-on and checked bags (https://goo.gl/fFwbPJ)
If you choose to use a bag lock, be sure that it is a TSA-recognized style
Tape a card with your name and contact information on all electronics
It's most efficient for security check, should they need to look through your bag, if you pack your items in layers
Firearms ARE allowed, but only in checked bags and must be "unloaded," placed in "lock," and inside a hard container. Also, you MUST declare the firearm to airlines prior
Pack large electronics like laptops and iPads accessible and/or at the top of your carry-on, to make check-in screening more efficient
Keep your ziplock baggie with liquids accessible in your carry as well, since you will need to remove it during security screening
If you will travel with your pet, you must bring a leash to remove the animal from its carrier, so that the carrier can be separately screened
This creates a private checklist in your account.