Pack for transitional weather when traveling from Charlotte Douglas International Airport (CLT) to Seattle-Tacoma International Airport (SEA) in September: light layers, a compact waterproof jacket, comfortable walking shoes, and a small umbrella. Charlotte tends to retain summer warmth into early September, while Seattle cools in the evenings—layering ensures comfort across both climates. For airport efficiency, enroll in TSA PreCheck or CLEAR if you travel frequently, pre-book parking at CLT, and download airline apps for mobile boarding passes and real-time alerts. If you’re visiting nearby destinations like Bellevue, Tacoma, Portland, or Vancouver, factor in additional ground-travel time and check schedules for ferries or regional trains. CTA: Prepare a September packing list and check live flight and weather updates before you head to the airport.