A lot of people have been having trouble with the carriers in free flight. And while they are around, they do move so it's tough to find them (just like in real life!). So here is the step by step to making your own carriers where ever you want without any add-ons.
Make sure you have the Acceleration SDK installed. If you don't, or if you have another version other than the one that came with Acceleration, you need to install the Acceleration version.
IMPORTANT: YOU MUST INSTALL THE ACCELERATION VERSION OF SDK FOR IT TO WORK.
The proper SDK version is on your Acceleration disk. To install it, insert your disk into the ROM drive as normal. If it begins to Autoplay, exit out. Then right-click on your ROM drive and choose "Explore". There you will find the SDK installer. Double-click the installer and follow as promted.
IMPORTANT: INSTALL THE SDK INTO THE DEFAULT FOLDER. IF YOU CHOOSE ANOTHER FOLDER IT WILL CAUSE PROBLEMS LATER.
The next time you fly in FSXA you should see a "Tools" option when you click "ALT" for the Menu Bar. (If not PM me).
Create a flight at any coastal airport of your choosing. Take off and fly out to sea. When you are in a position over the water that you like (you must be over the water for this to work), pause the game. Hit "ALT" to get the Menu Bar. Under "Tools" choose "Traffic Toolbox" and then "Explorer". In the Explorer window, right-click and then click "Create".
Click the "Non-Aircraft" option toward the bottom. Then, from the vehicle drop-down list, choose "veh_carrier01_high_detail_sm". Back toward the bottom, click the "Select Coords" button. At the top of the new window select the "User aircraft" option. The postion of your airplane will then appear in the coordinates. Finally, make sure that you enter a "0" in the "altitude" section. Otherwise the carrier will have a long drop down to the water.
Click "OK". Unpause the game and look down. If you did it all right there should be a carrier right under you.
If you have any questions feel free to ask. -Micro