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So I got the inspiration from the An 225,which is designed to be used to carry the space shuttle,but I don't have any cargo planes.Then I found the one DJS8 made,and then added something even more exciting—the racing plane Type X-3.1(second generation)
I just meant to let you guys focus on my Type X-3.1,so do not just stick to the cargo plane,although it is also very good.
I used a cargo plane by DJS8Corp and attached my latest and best work Type X-3.1 to it.If you want to know more,please check look at the bottom.
ag1 to activate reverse engines ;
ag2 to detach Type X from the cargo plane;
ag7 to activate all the engines on Type X.
Have fun!

Type X's third version,improved reliability greatly and speed.The 3.1 improved speed.This plane is so amazing.It can finish Oceanview Speedway in 60 seconds(which is 1sec faster than the 3.0 version)You have to save it,select it as PLAYER in race against opponent(when selected as enemy it loses control,and I don’t know why),then select an enemy(does not matter),select Oceanview Speedway and start.It has a 70%chance to reach the destination.

https://www.simpleplanes.com/a/2Fmq4Z/2ndGen-Racing-Type-X-3-1