Think the Fourth of July travel boom is all about airports and highways? Think again. This week, AAA dropped numbers showing a slim record—but here’s the catch.

Strip out cruises, and that growth nearly evaporates. That’s right. While everyone’s obsessing over packed flights and rental car lines, cruise ships are quietly carrying the entire holiday surge.

More Americans are literally floating their Independence Day. So if you’re planning to travel next week, skip the gridlock and check the gangway. Cruises aren’t just a vacation anymore—they’re the backbone of the holiday.