Millions of U.S. residents will be driving or flying over the Fourth of July weekend.
AAA projects nearly 43 million Americans will travel over the weekend, making it the highest Fourth of July travel volume on record.
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Southwest has issued a travel advisory on its website, warning customers of potential long waits at security lines.
The Transportation Security Administration is expecting long lines at checkpoints over the Fourth of July weekend, especially for morning travelers, Southwest posted on its website.
TSA recommends arriving at least two hours early for domestic travel and three hours early for international travel.
The holiday travel period is defined as June 30 to July 4.