There are different methods to avoid lines at the airport. Some assist with SECURITY lines while others are designed to assist with CUSTOMS lines. These are very different so let's get them straight:
CUSTOMS - refers to items being brought into a country upon the return from your trip
IMMIGRATION - refers to people entering a country either as a visitor or returning home
SECURITY - everyone traveling by air in the US (domestic or international) must pass through security upon leaving for your trip.
To avoid the masses and get through lines quicker, you can choose to join a program to expedite the process. See the chart below to decide which program is best for you!
I have no affiliation with any of these programs.
I personally use Global Entry because I travel internationally at least once a year and domestically many times a year - I love the TSA precheck for both domestic and international flights and expedited immigration/customs lines when returning to the US. In addition, my credit card covers the cost of Global Entry, so getting it for free was a no brainer.
Here are the links to sign up:
GLOBAL ENTRY AND TSA PRECHECK https://ttp.cbp.dhs.gov/
MOBILE PASSPORT: App Store
AUTOMATED PASSPORT CONTROL: no membership