While summer vacations may still be underway, travelers planning for a Labor Day Weekend end of the season may want to take new data into account. The holiday weekend, which traditionally marks the end of the summer travel season, will see travelers explore popular travel hotspots both in the United States and around the world. Friday, Sept. 1 and Monday, Sept. 4 will be the busiest days for airport traffic as flyers jet to and from their destinations around the world, according to new data from Chase Travel shared with Travel + Leisure this week.