How to make smoke trails in SimplePlanes!

So, I am almost to 50 subscribers! And this is a huge point in my channel that I wanted to celebrate! I will not go into detail, but I will be doing a special on the SimplePlanes website! There will be a trailer, an announcement forum, and anyone can join it! I will be waiting until I hit 50 subscribers, so subscribe if you haven’t! I am not the kind of person to ask in videos to subscribe, (I have before a couple times). But I really dislike having You-tubers constantly asking to subscribe in their videos, so I decided that I will not ask! But this is a really big event, so if you haven’t, think about it at least. If you watched my past videos, you will know that this video is a little different from my older ones, so I will list all new things I have done.
1. New music! No more listening to those old loops!
2. New intro, a bit basic, but it works.
3. Better quality, no more low pixel stills that hurt your eyes.
4. All the text has animation!
5. Speed changes for boring parts!
6. Transitions!
These are all changes that will make the video better! So if you like this format, tell me! I don’t know what anyone wants or needs, so I can only assume! Negating me helping you in some ways!

Also, time stamps!
0:00 Intro
0:05 announcement
0:19 Start of video
0:43 Start of jet
3:04 Transition
3:08 Start of smoke trails
4:47 Start of test 1
6:16 Start of test 2
7:12 Start of test 3
7:53 Final Test
8:12 Outro

And about earlier, the special will be on my channel, and my SimplePlanes profile! So follow me if you want in the special!
SP Profile: https://www.simpleplanes.com/u/SPMTB