How do you get multiple F-Airs in one jump?

[Thermal]

I recently picked up Wario and after alot of video watching I have noticed people have been able to chain a few fairs without touching the ground. I am well aware of Wario's aerial mobility but I can never pull it off before having to land. Here is a video example of what I am trying to achieve.

https://youtu.be/eurP71CEhX8?t=13m23s

 

[Matasd]

You have to full jump to fair more than once, no short hop. Also in that video he ledge canceled into more fairs so not just a jump