Pack layers for Tokyo’s cool December weather, including a warm jacket, gloves, and a compact umbrella for occasional rain. To minimize jet lag between Dallas and Tokyo, consider gradually shifting your sleep schedule before departure, stay hydrated on the flight, and spend morning daylight hours in Tokyo to realign circadian rhythms. During December holidays, leave extra time for airport security and customs—arrive 3 hours prior to international departures from Dallas/Fort Worth International Airport (DFW). Have digital copies of travel documents and use mobile boarding passes and transit apps for Haneda transfers. Finally, check winter weather alerts and allow cushion time for missed connections; consider travel insurance for trips during peak December travel windows. CTA: Prepare now—check your flight status and pack smart for DFW to HND December travel.