Lambert passengers make their way past Delta gate A2 on the Friday before Memorial Day.

The Memorial Day holiday weekend and a heat wave are sure signs that summer has arrived in St. Louis. The kickoff to the summer travel season has been very evident throughout Lambert this week. Airline gate areas, concourses, bag claims--all seem to be bustling with a boost of passengers. If the spring is any indication, the Airport will be showing strong activity through the summer. Lambert’s first quarter passenger traffic was up 3.4 percent.