Hiya Theresa!
Welcome to planDisney! Congrats on purchasing your tickets to Walt Disney World Resort! You are now one step closer to a magical vacation at one of my favorite places on Earth.
So Theresa, what you call "fast tracking" is now called Lightning Lane Multi Pass and Lightning Lane Single Pass. I know, I know, so many new names. It's been a wild few years.
Lightning Lane Multi Pass and Single Pass came into existence earlier this year and we are still getting used to it. It's a new way to purchase a pass that lets you book return times to enter the Lightning Lane of an attraction and have a shorter wait. Lightning Lane Multi Pass gives you access to quite a few attractions and experiences while Single Pass is for a single attraction. This single attraction is usually a newer one and is very popular such as
TRON Lightcycle / Run. It can only be purchased through the My Disney Experience Mobile App and only by people currently in the United States and Canada. Also, access to download the My Disney Experience Mobile App is limited internationally.
As soon as you arrive on US soil make sure your phone recognizes your new location. If you are staying at a
Walt Disney World Resort Hotel you can purchase Lightning Lane Multi Pass or Lightning Lane Single Pass 7 days before your first day. If you are staying elsewhere then you can purchase them 3 days before you arrive. My advice is to purchase it as soon as you can and start picking your top three choices for the day. The passes are purchased for each day you wish to use it. Another advantage of staying onsite is that you can purchase them for the entirety of your stay up to 14 days. The rest of the world will have to wait each morning at 7 am to make your purchase. After you enter the Parks and use your first Lightning Lane you can book another one. Every time you use a Lightning Lane that day you can continue to book another one and keep going until they run out or you don't want to do it anymore. I suggest booking one Lightning Lane return time for the morning so that you can get it done and make your next one right away. Your day can now be filled with so many shorter wait times!
I hope this helps and you have a wonderful time!
Happy planning!
-Nimmy