If you are living with HIV, AIDS or any other illness, be sure to discuss travel with your doctor. Also, pack more medication than you think you need.
That way, should your flight be canceled, you'll have enough. Lastly, keep your meds in two locations- some in your carry on luggage and the rest in your check-in bags. That way, if your luggage is lost you'll still be covered.
I always pack at the last minute. It keeps me from overpacking. Too much time equals too much stuff. Bring only your favorite jacket—be it sport or casual—and only two pairs of shoes (and one them has to be the pair you wear on the plane). And only two pairs of jeans, no matter what. Basics travel best, but avoid light colors.